Document: Monitoring Report Aug 2025
Section: Executive Summary
Type: text

High resolution multi-spectral and microwave (SAR) images of foreign satellites at 10 m resolution have been processed and analysed in open-source cloud computing platform Google Earth Engine using

automatic algorithm which has been developed in-house. Visual inspection & manual digitisation has been used to supplement the automatic algorithm to complete the task. The Monthly Monitoring Report is shared with all stakeholders through email for further necessary action. The reports are also e-published on CWC website for any time access by the concerned (https://cwc.gov.in/glacial-lakeswater-bodies-himalayan-region)

**Map of Study Area showing Glacial Lakes and Water Bodies being monitored by CWC**

**Limitations and Assumptions:**

**Limitations:**

*   Glacial lake identification can be done either using visual interpretation or automatic mapping methods. The automatic mapping procedures have limitations due to varying terrain conditions such as lakes situated in the shadow portions of mountains, presence of snow cover, cloud cover, lakes being partly frozen, etc. As lake water absorbs the incident radiation making it appear in darker tone and colour in the standard FCC of satellite data, similar response also prevails over shadow region of clouds or mountains on surface, which may lead to incorrect mapping. Moreover, a mountain shadow covering a lake partly/completely within its vicinity, also makes it difficult to accurately map the lake boundary.
*   A few Glacial lakes could not be mapped owing to the constraints such as Glacial lakes being under frozen condition, presence of snow or cloud cover over the lakes, lakes under mountain shadow or lakes in dried up condition.

**Assumptions:**

*   Inclusion or exclusion of water pixels near lake boundaries depending on more than or less than certain fraction of its area falling within the lake boundary.

This document presents the analysis and results of monitoring of 902 GL&WBs for August 2025. The lakes are analysed for change in water spread area with respect to area of Inventory 2011 and are categorized into 5 classes.

(i) increase in water spread area greater than 40%
(ii) increase in water spread area up to 40%
(iii) no change in water spread area
(iv) decrease in water spread area
(v) change detection not performed due to reasons such as frozen condition, dried up condition, cloud cover etc.

The change detection in water spread area of 477 GLs & WBs greater than 50 Ha have been calculated for the following three cases.

*   Difference between the current area of lake and base year area(2011)
*   Difference between the current area of lake and Last five years average area(2020-2024)
*   Difference between the current area of lake and Last ten years average area(2015-2024)

The minimum of change observed from the above three cases has been adopted to identify increase, decrease and no change in water spread area.

As the monitoring of 385 GLs with water spread area between 10 Ha & 50 Ha was initiated in 2022, the change detection in water spread area has been calculated for the following two cases

*   Difference between the current area of lake and base year area(2011)
*   Difference between the current area of lake and last three years average area(2022-2024)

The minimum of change observed from the above two cases has been adopted to identify increase, decrease and no change in water spread area.

For the remaining 40 GLs, as the inventory details (base year 2011) are not available and monitoring data being available only since 2022, the change detection in water spread area has been calculated as the

*   Difference between the current area of lake and last three years average area(2022-2024)


Document: Monitoring Report Aug 2025
Section: Executive Summary
Type: text

two cases * Difference between the current area of lake and base year area ( 2011 ) * Difference between the current area of lake and last three years average area ( 2022 - 2024 ) The minimum of change observed from the above two cases has been adopted to identify increase , decrease and no change in water spread area . For the remaining 40 GLs , as the inventory details ( base year 2011 ) are not available and monitoring data being available only since 2022 , the change detection in water spread area has been calculated as the * Difference between the current area of lake and last three years average area ( 2022 - 2024 )

For the 1941 Glacial Lakes being newly monitored from the year 2025, the change detection in water spread area has been calculated as the

* Difference between the current area of lake and base year area (2021; as per Glacial Lake Atlas 2023)

The number of lakes in each class has been identified. The lakes showing an increase in water spread area greater than 40% have been identified as those requiring vigorous monitoring for disaster purpose.

**Results:**

**Outcome of Monitoring of 902 GLs & WBs, August 2025**

**Outcome of Monitoring of 1941 GLs as per Glacial Lake Atlas 2023, August 2025**

**Combined Outcome of Monitoring total 2843 GLs & WBs, August 2025**

**Conclusions:**

**Conclusion of Monitoring of 902 GLs & WBs of Indian Himalayan Region**

* **12 Water Bodies and 1 Glacial Lake** (>50Ha area) show increase in area greater than 40% when change detection was carried out with respect to base year area(2011), average area of last 5 years(2020-2024) & average area of last 10 years(2015-2024). These Glacial lake and Water Bodies are located in China.

* 26 nos. of Glacial Lakes & Water Bodies have been merged to 13 nos. of Glacial Lakes & Water Bodies & combined area of merged glacial lakes and water bodies has been shown against respective glacial lakes and water bodies. However, merging and demerging of lakes is a dynamic process; hence figure of 902 Glacial Lakes & Water Bodies has been kept intact for analysis part. Details of merged Glacial Lakes & Water Bodies are as under.


Document: Monitoring Report Aug 2025
Section: Executive Summary
Type: table
Table

| Sl. No. | ID | GL/WB | Location | Remarks |
|---|---|---|---|---|
| 1 | 03_71G_008 | WB | China | Merged with nearby lake not in inventory 2011 |
| 2 | 03_71K_011 | WB | China | Merged with nearby lake not in inventory 2011 |
| 3 | 03_82N_032 | GL | China | Merged with nearby lake not in inventory 2011 |
| 4 | 03_62O_040 | WB | China | Merged with nearby lake not in inventory 2011 |
| 5 | 01_61C_014 | WB | China | Merged with each other |
| | 01_61C_015 | WB | | |
| 6 | 03_78E_009 | WB | China | Merged with each other |
| | 03_78E_010 | WB | | |
| 7 | 03_62O_041 | WB | China | Merged with each other |
| | 03_62O_042 | WB | | |
| 8 | 03_71K_007 | WB | China | Merged with each other |
| | 03_71K_009 | WB | | |
| 9 | 03_91C_035 | GL | China | Merged with each other |
| | 03_91C_036 | GL | | |
| 10 | 02_71P_018 | WB | China | Merged with each other |
| | 02_71P_019 | GL | | |
| | 02_71P_020 | GL | | |
| 11 | 03_77L_048 | GL | China | Merged with each other |
| | 03_77L_053 | GL | | |
| 12 | 01_61C_002 | WB | China | Merged with each other |
| | 01_61C_004 | WB | | |
| | 01_61C_005 | WB | | |
| | 01_61C_010 | WB | | |
| | 01_61C_011 | WB | | |
| 13 | 01_52H_003 | GL | India (Himachal Pradesh) | Merged with each other |
| | 01_52H_004 | GL | | |


Document: Monitoring Report Aug 2025
Section: Executive Summary
Type: text

*   **9 Glacial Lakes (10 ha-50 Ha area)** show increase in area greater than 40% when change detection was carried out with respect to base year area (2011), average area of last 3 years (2022-2024). 7 GLs are located in China. The remaining 2 Glacial lakes are located in India **(Jammu & Kashmir- 1 No. & Sikkim – 1 No.).**
*   The total Inventory area of **Glacial Lakes and Water Bodies** was 5,30,654 Ha during the year 2011 which has increased to 5,79,700 Ha during the year 2025 (August). There is a **9.24%** increase in area. *(Out of 902 GsL&WBs, only 798 GLs&WBs were considered for this interpretation. The remaining lakes include 40 SDC lakes which have no inventory details as well as GLs/WBs which were not analyzed/have been merged during the month of August, 2025.)*
*   The total Inventory area of **Glacial Lakes** was 19,848 Ha during the year 2011 which has increased to 23,536 Ha during the year 2025 (August). There is a **18.58%** increase in area. *(Out of 544 GLs, only 465 GLs were considered for this interpretation. The remaining lakes include 40 SDC lakes which have no inventory details as well as lakes which were not analyzed/ have been merged during the month of August, 2025.).*

*   The total Inventory area of **Glacial Lakes within India** was 1,995 Ha during the year 2011 which has increased to 2,445 Ha during the year 2025 (August). There is a **22.56%** increase in area. *(Out of 100GLs, only 55 GLs were considered for this interpretation. The remaining lakes include 40 SDC lakes which have no inventory details as well as lakes which were not analysed/have been merged during the month of August, 2025.).*
*   **54 Glacial Lakes** (out of 100) located within India, as shown below, display increase in water spread area during the month of August 2025, and hence **demand vigorous monitoring for disaster purpose** *(Ladhak-5, Jammu & Kashmir-6, Himachal Pradesh-10, Uttarakhand- 4, Sikkim – 24 & Arunachal Pradesh-5).*

**Conclusion of Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)**

*   The total Inventory area of newly monitored **Glacial Lakes within India as per Glacial Lake Atlas, 2023** was 12,939 Ha in the year 2021 which has increased to 13,260 Ha during the year 2025 (August). There is a **5.26%** increase in area. *(Out of 581GLs, only 518 GLs were considered for this interpretation. The remaining lakes were not able to be analysed during the month of August, 2025.).*
*   The total Inventory area of newly monitored **Glacial Lakes located in transboundary region as per Glacial Lake Atlas, 2023** was 43,723 Ha in the year 2021 which has increased to 45,862 Ha during the year 2025 (August). There is a **4.89%** increase in area. *(Out of 1360 GLs, only 1247 GLs were considered for this interpretation. The remaining lakes were not able to be analysed during the month of August, 2025.).*


Document: Monitoring Report Aug 2025
Section: Executive Summary
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remaining lakes were not able to be analysed during the month of August , 2025 . ) . * * The total Inventory area of newly monitored * * Glacial Lakes located in transboundary region as per Glacial Lake Atlas , 2023 * * was 43 , 723 Ha in the year 2021 which has increased to 45 , 862 Ha during the year 2025 ( August ) . There is a * * 4 . 89 % * * increase in area . * ( Out of 1360 GLs , only 1247 GLs were considered for this interpretation . The remaining lakes were not able to be analysed during the month of August , 2025 . ) . *

*   **374 Glacial Lakes** (out of 581) located within India as per Glacial Lake Atlas 2023, as shown below, display **increase in water spread area during the month of August 2025**, and hence **demand vigorous monitoring for disaster purpose** *(Ladhak-128, Jammu & Kashmir-44, Himachal Pradesh-3, Uttarakhand- 3, Sikkim – 20 & Arunachal Pradesh-176)*.

**Conclusion on Combined Monitoring of 2843 Glacial lakes being monitored by CWC**

*   **428 Glacial Lakes** (out of 681) located within India as per Glacial Lake Atlas 2023, as shown below, display **increase in water spread area during the month of August 2025**, and hence **demand vigorous monitoring for disaster purpose** *(Ladhak-133, Jammu & Kashmir-50, Himachal Pradesh-13, Uttarakhand- 7, Sikkim – 44 & Arunachal Pradesh-181)*.

***


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.1 Glacial Lakes and Water Bodies
Type: text

A glacial lake is a body of water with origins from a glacier. It is formed when a glacier erodes the surface before melting and the melt water fills the resulting depression. The water in Glacial Lakes accumulates behind loose naturally formed 'glacial/moraine dams' made of ice, sand, pebbles and ice residue as the glaciers melt. Various types of lakes may have different levels of hazard potential depending upon many factors such as the nature of damming materials, position of the lake, volume of the water, the nature and position of the associated mother glacier, physical and topographical conditions, and other physical conditions of the surroundings. Interaction between the risk factors and triggering processes such as ice avalanches, debris flows, rock fall, earthquake or landslides reaching a lake strongly affect the risk of a lake outburst. Moraine-dammed lakes located at the snout of a glacier have a high probability of breaching with high hazard potential and can breach suddenly leading to catastrophic floods. Such outburst floods are known as Glacial Lake Outburst Flood (GLOF).

A water Body referred in this report is the body of water retained permanently due to obstruction created naturally or artificially but not directly associated with Glaciers.

1. Introduction
1.1 Glacial Lakes and Water Bodies


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.2 Glacial Lakes in Indian Himalayan Region
Type: text

The Indian Himalayan Region (IHR) contains the world’s largest number of glaciers and snow outside the Polar Regions and are aptly called Third Pole of the world. It consists of three major river systems, ie, Indus, Ganga and Brahmaputra stretching over five countries viz. India, China, Nepal, Myanmar and Bhutan.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

The work of monitoring of Glacial Lakes/Water Bodies (GLs/WBs) was taken up by CWC, DoWR, RD&GR, Ministry of Jal Shakti, during XI Plan period in the year 2009, under DWRIS Plan scheme. The inventory of glacial lakes and water bodies of the Himalayan region of Indian river basins published in August, 2011 was done in association with National Remote Sensing Centre (NRSC), Hyderabad based on the satellite data of Advanced Wide Field Sensor (AWiFS) of the Indian Remote Sensing Satellite, Resourcesat-1 collected from May to November, 2009. The inventory consisted of a total of 2028 Glacial Lakes and Water Bodies with water spread area greater than 10 Ha. The country-wise and basin-wise details of the Inventory are furnished in **Table No. 1.1** and **Table No. 1.2**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: table
Table: Table 1.1: Country-wise details of Glacial Lakes & Water Bodies of Inventory (2011)

| **Country** | **Glacial Lakes >10 Ha (Nos.)** | **Water Bodies >10 Ha (Nos.)** | **Total >10 Ha (Nos.)** |
| :--- | :--- | :--- | :--- |
| India | 60 | 448 | 508 |
| Bhutan | 77 | 124 | 201 |
| Nepal | 57 | 45 | 102 |
| China | 309 | 904 | 1213 |
| Myanmar | - | 4 | 4 |
| **Total** | **503** | **1525** | **2028** |

Country
Glacial Lakes >10 Ha (Nos.)
Water Bodies >10 Ha (Nos.)
Total >10 Ha (Nos.)


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: table
Table: Table 1.2: Basin-wise details of Glacial Lakes & Water Bodies of Inventory (2011)

| **Basin Name** | **Glacial Lakes (Nos.)** | **Water Bodies (Nos.)** | **Total (Nos.)** |
| :--- | :--- | :--- | :--- |
| Brahmaputra | 294 | 1099 | 1393 |
| Ganga | 178 | 105 | 283 |
| Indus | 31 | 321 | 352 |
| **Total** | **503** | **1525** | **2028** |

Basin Name
Glacial Lakes (Nos.)
Water Bodies (Nos.)
Total (Nos.)


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

**1.4 Glacial Lake Atlas of Indian Himalayan River Basins in 2023**

NRSC has published Glacial Lake Atlas of Indian Himalayan River Basins in the year 2023. The atlas depicts distribution of 28,043 glacial lakes of size greater than 0.25 ha mapped using high resolution Resourcesat-2 LISS4 MX satellite data of 2016-17. The atlas presents the details of glacial lakes in terms of area, type and elevation and administrative unit wise for all three river basins i.e. Indus, Ganga and Brahmaputra. Ten different types of glacial lakes are identified and categorized into four major classes, viz., Moraine-dammed Lake, Ice-dammed lake, Glacier Erosion lake, and Other Glacial lake.

The abstract of Glacial Lakes as per Glacial Atlas of IHR of NRSC 2023 is given in following **Table No. 1.3**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: table
Table: Table 1.3: Abstract of Glacial Lakes as per Glacial Lake Atlas of IHR of NRSC 2023

| **Size(Ha)** | **No of Glacial Lakes: India** | **No of Glacial Lakes: Transboundary** | **Total** |
| :--- | :--- | :--- | :--- |
| 0.25-1 | 3342 | 9194 | 12536 |
| 1-5 | 2862 | 7769 | 10631 |
| 5-10 | 712 | 1733 | 2445 |
| 10-50 | 596 | 1536 | 2132 |
| >50 | 58 | 241 | 299 |
| **Total** | **7570** | **20473** | **28043** |

Size(Ha)
No of Glacial Lakes: India
No of Glacial Lakes: Transboundary
Total


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

**1.5 Objectives**

The broad objectives of the study are
*   To monitor the spatial extent in terms of water spread area of the Glacial Lakes &Water Bodies from the inventory on monthly basis during August to October.
*   To detect temporal changes in water spread area of Glacial Lakes & Water Bodies.
*   To share the report with concerned stakeholders including National Disaster Management Authority / State Disaster Management Authority for suitable action.

**1.6 Limitations and Assumption**

**Limitations**
*   Glacial lake identification can be done either using visual interpretation or automatic mapping methods. The automatic mapping procedures have limitations due to varying terrain conditions such as lakes being situated in the shadow portions of mountains, presence of snow cover, cloud cover, lakes being partly frozen, etc. As lake water absorbs the incident radiation making it appear in darker tone and colour in the standard FCC of satellite data, similar response also prevails over shadow region of clouds or mountains on surface, which may lead to incorrect mapping. Moreover, a mountain shadow covering a lake partly/completely within its vicinity, also makes it difficult to accurately map the lake boundary.
*   A few Glacial lakes could not be mapped owing to the constraints such as they being under frozen condition, presence of snow or cloud cover over the lakes, lakes under mountain shadow or lakes in dried-up condition.

**Assumptions:**
*   Inclusion or exclusion of water pixels near lake boundaries depending on more than or less than certain fraction of its area falling within the lake boundary.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: table
Table: Table 2.4: Abstract of State-wise & Basin-wise details of 902 GLs&WBs being monitored monthly by CWC

| Country/Area | State/ Union Territory | No of Glacial Lakes: Indus Basin | No of Glacial Lakes: Ganga Basin | No of Glacial Lakes: Brahma-putra Basin | No of Glacial Lakes: Total | No of Water Bodies: Indus Basin | No of Water Bodies: Ganga Basin | No of Water Bodies: Brahma-putra Basin | No of Water Bodies: Total | Grand Total |
|---|---|---|---|---|---|---|---|---|---|---|
| India | Ladakh | 15 | 0 | 0 | 15 | 26 | 0 | 0 | 26 | 41 |
| | Jammu & Kashmir | 15 | 0 | 0 | 15 | 16 | 0 | 0 | 16 | 31 |
| | Himachal Pradesh | 10 | 0 | 0 | 10 | 5 | 0 | 0 | 5 | 15 |
| | Uttarakhand | 0 | 9 | 0 | 9 | 0 | 6 | 0 | 6 | 15 |
| | Sikkim | 0 | 0 | 42 | 42 | 0 | 0 | 1 | 1 | 43 |
| | Arunachal Pradesh | 0 | 0 | 9 | 9 | 0 | 0 | 25 | 25 | 34 |
| | Total | 40 | 9 | 51 | 100 | 47 | 6 | 26 | 79 | 179 |
| | India Total | | | | 100 | | | | 79 | 179 |
| Transboundary | China | 12 | 110 | 187 | 309 | 49 | 19 | 191 | 259 | 568 |
| | Bhutan | 0 | 0 | 71 | 71 | 0 | 0 | 11 | 11 | 82 |
| | Nepal | 0 | 64 | 0 | 64 | 0 | 9 | 0 | 9 | 73 |
| | Total | 12 | 174 | 258 | 444 | 49 | 28 | 202 | 279 | 723 |
| | Transboundary Total | | | | 444 | | | | 279 | 723 |
| Grand Total | | | | | 544 | | | | 358 | 902 |

Country/Area
State/ Union Territory
No of Glacial Lakes: Indus Basin
No of Glacial Lakes: Ganga Basin
No of Glacial Lakes: Brahma-putra Basin
No of Glacial Lakes: Total
No of Water Bodies: Indus Basin
No of Water Bodies: Ganga Basin
No of Water Bodies: Brahma-putra Basin
No of Water Bodies: Total
Grand Total


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

(iii) **1941** Glacial Lakes **being monitored from 2025** with water spread area above 10 Ha, sourced from the Glacial Lake Atlas of Indian Himalayan River Basins published by National Remote Sensing Centre, March 2023. This includes 180 Glacial Lakes with water spread area above 50 Ha and 1761 Glacial Lakes with water spread area between 10 Ha to 50 Ha. 581 Glacial lakes are located within India whereas the remaining 1360 Glacial Lakes are located transboundary.

The abstract of state-wise and basin-wise details of the 1941 GLs being monitored from 2025 as per Glacial Lake Atlas 2023, are furnished in **Table no. 2.5.**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: table
Table: Table 2.5: Abstract of State-wise & Basin-wise details of 1941GLs as per Glacial Lakes Atlas being monitored monthly by CWC

| Country/Area | State/UT | Glacial Lakes of size greater than 10Ha as per Glacial Lakes Atlas, 2023: Indus Basin (Nos.) | Glacial Lakes of size greater than 10Ha as per Glacial Lakes Atlas, 2023: Ganga Basin (Nos.) | Glacial Lakes of size greater than 10Ha as per Glacial Lakes Atlas, 2023: Brahmaputra Basin (Nos.) | Grand Total (Nos.) |
|---|---|---|---|---|---|
| India | Ladakh | 164 | 0 | 0 | 164 |
| | Jammu & Kashmir | 61 | 0 | 0 | 61 |
| | Himachal Pradesh | 5 | 2 | 0 | 7 |
| | Uttarakhand | 0 | 4 | 0 | 4 |
| | Sikkim | 0 | 0 | 30 | 30 |
| | Arunachal Pradesh | 0 | 0 | 315 | 315 |
| | Total | 230 | 6 | 345 | 581 |
| | India Total | | 581 | | |
| Transboundary | Transboundary | 49 | 185 | 1126 | 1360 |
| | Total Transboundary | | 1360 | | |
| Grand Total | | | 1941 | | |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

Hence, CWC monitors a total of 2843 Glacial Lakes and Water Bodies of Indian Himalayan Region. This includes 2485 Glacial lakes and 358 Water Bodies. The break-up of 2843 GLs & WBs is shown in **Figure 2.2.**

The index map of the study area is shown in **Figure. 2.3**, and the location map of the study area showing the glacial lakes and Water Bodies being monitored by CWC is shown in **Figure.2.4**.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.3: Index Map of Study Area

**Figure 2.3: Index Map of Study Area**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.4: Map of Study Area showing Glacial Lakes and Water Bodies being monitored by CWC

**Figure 2.4: Map of Study Area showing Glacial Lakes and Water Bodies being monitored by CWC**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

The GLs & WBs are mostly located at an elevation range of 3000m to 5500m. A few of them are located above elevation of 5500m and some below 3000m. The elevation of Waterbodies range from 200 m to 5000m. This can be visualized by comparing the location map of study area (**Figure 2.4**) with the relief map of the study area shown in **Figure 2.5**. The elevation range of GLs & WBs being monitored by CWC is shown in **Figure 2.6** & **Figure 2.7**.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.5: Relief Map of the Study Area

**Figure 2.5: Relief Map of the Study Area**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.6: Elevation Range of 902 GLs & WBs within Indian Himalayan Region being monitored by CWC

**Figure 2.6: Elevation Range of 902 GLs & WBs within Indian Himalayan Region being monitored by CWC**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.7: Elevation Range of total 2843 GLs & WBs within Indian Himalayan Region being monitored by CWC(as per Glacial Lake Atlas 2023)

**Figure 2.7: Elevation Range of total 2843 GLs & WBs within Indian Himalayan Region being monitored by CWC(as per Glacial Lake Atlas 2023)**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

***

The country-wise distribution of Glacial Lakes & Water Bodies being monitored by CWC is shown in **Figure 2.8 & Figure 2.9**.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.8: Country-wise distribution of 902 GLs & WBs in Indian Himalayan Region being monitored by CWC

**Figure 2.8: Country-wise distribution of 902 GLs & WBs in Indian Himalayan Region being monitored by CWC**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: figure
Figure: Figure 2.9: Country-wise distribution of total 2843 GLs & WBs in Indian Himalayan Region being monitored by CWC(as per Glacial Lake Atlas 2023)

**Figure 2.9: Country-wise distribution of total 2843 GLs & WBs in Indian Himalayan Region being monitored by CWC(as per Glacial Lake Atlas 2023)**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

The monitoring was done by downloading and manually digitising Advanced Wide Field Sensor (AWiFS) Satellite imageries procured/ downloaded from NRSC till 2021. High resolution SENTINEL-2 Multi-Spectral Imagery (MSI) and *Sentinel-1* Synthetic Aperture Radar (SAR) data (Microwave Imagery) have been utilized for the study, thereafter in Google Earth Engine platform.

**2.2.1 Sentinel-2 Multi Spectral Imagery**

The Sentinal-2 mission comprises of a constellation of two polar-orbiting satellites placed in the same sun-synchronous orbit, phased at 180° to each other. It is a wide-swath, high-resolution, multi-spectral imaging mission for monitoring of vegetation, soil and water cover, inland waterways and coastal areas. The SENTINEL-2 Multi-Spectral Instrument (MSI) has visible, near infrared and shortwave infrared sensors sampling 13 spectral bands - 4 bands at 10 m, 6 bands at 20 m and 3 bands at 60 m spatial resolution with a swath width of 290 km. The revisit frequency of each single SENTINEL-2 satellite is 10 days and the combined constellation revisit is 5 days. The Green, Red and NIR bands have been utilized for this study.

**2.2.2 Sentinel-1 Synthetic Aperture Radar (Microwave Imagery)**

The *Sentinel-1* mission comprises a constellation of two polar-orbiting *satellites*, *Sentinel-1A and Sentinel-1B, sharing the same orbital plane*. It has C-band synthetic aperture radar (SAR) active sensor. Synthetic Aperture Radar (SAR) has the advantage of operating at wavelengths not impeded by cloud cover or a lack of illumination and can acquire data over a site during day or night time under all weather conditions. SAR actively transmits microwave signals towards the Earth and receives a portion of transmitted energy as backscatter from the ground. The SAR instrument provides radar backscatter measurements influenced by the terrain structure and surface roughness. Generally, the more roughness or structure on the ground, the greater the backscatter. Rough surfaces will scatter the energy and return a significant amount back to the antenna resulting in a bright feature. The C-band imaging operates in four exclusive imaging modes with different resolution (down to 5 m) and coverage (up to 400 km). It provides dual polarisation capability, very short revisit times and rapid product delivery. It can transmit a signal in either horizontal (H) or vertical (V) polarisation, and then receive in both H and V polarisations. For each observation, precise measurements of spacecraft position and altitude are available. The repeat orbit cycle of each Sentinel-1 satellite is 12-day. The backscatter intensity of vertical transmit-vertical receive (X) band (VV band) data has been utilized for the study.

**3. Methodology**

Google Earth Engine(GEE) has been used to process the Multispectral and Microwave Sentinel image data for the monitoring of Glacial Lakes & Water Bodies. Google Earth Engine (GEE) is a cloud-based geospatial analysis platform that enables users to visualize and analyze satellite images. The Microwave and Multispectral Satellite works on different principle, and hence separate methodology has been adopted to compute the water spread area of GL&WBs in an automatic manner.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
Type: text

12 - day . The backscatter intensity of vertical transmit - vertical receive ( X ) band ( VV band ) data has been utilized for the study . * * 3 . Methodology * * Google Earth Engine ( GEE ) has been used to process the Multispectral and Microwave Sentinel image data for the monitoring of Glacial Lakes & Water Bodies . Google Earth Engine ( GEE ) is a cloud - based geospatial analysis platform that enables users to visualize and analyze satellite images . The Microwave and Multispectral Satellite works on different principle , and hence separate methodology has been adopted to compute the water spread area of GL & WBs in an automatic manner .

Multispectral data consist of visible and infrared bands. The spectral combination of NIR, red & green bands is used to generate false colour composite (FCC). The Normalised Difference Water Index (NDWI) is computed using green and NIR band. The process of calculation of NDWI and FCC is repeated for each GL&WB. The OTSU algorithm is further used to identify the threshold of NDWI for segregating water pixels from other types of features. The detected water pixels are further summed to calculate water spread area in the region of interest.

Microwave data of Sentinel-1 is a phase-preserving dual polarisation SAR system. The backscatter intensity of vertical transmit vertical receive (X) band has been used to distinguish water pixels from other types of features. The OTSU algorithm is further used to identify the threshold of backscatter intensity for segregation. The water spread area of each lake has been calculated by summation of water pixels in the region of interest.

The automated area of the GLs&WBs are then verified manually in GEE. The lakes which show discrepancy in automated area extraction are required to be delineated manually based on the visual interpretation. This is required as the region being monitored has rugged terrain with high mountains and deep valleys, which may lead to effects like foreshortening, layover, mountain shadows etc in the microwave/SAR data. Cloud cover hinders the performance of Multispectral Satellite images.

The change detection in water spread area of 477 GLs & WBs greater than 50 Ha have been calculated for the following three cases.
* Difference between the current area of lake and base year area(2011)
* Difference between the current area of lake and Last five years average area(2020-2024)
* Difference between the current area of lake and Last ten years average area(2015-2024)

The minimum of change observed from the above three cases has been adopted to identify increase, decrease and no change in water spread area.

As the monitoring of 385 GLs with waterspread area between 10 Ha & 50 Ha was initiated in 2022, the change detection in water spread area has been calculated for the following two cases

* Difference between the current area of lake and base year area(2011)
* Difference between the current area of lake and last three years average area(2022-2024)

The minimum of change observed from the above two cases has been adopted to identify increase, decrease and no change in water spread area.

For the remaining 40 GLs, as the inventory details (base year 2011) are not available and monitoring data being available only since 2022, the change detection in water spread area has been calculated as the

* Difference between the current area of lake and last three years average area(2022-2024)

For the 1941 Glacial Lakes being newly monitored from the year 2025, the change detection in water spread area has been calculated as the


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and last three years average area ( 2022 - 2024 ) The minimum of change observed from the above two cases has been adopted to identify increase , decrease and no change in water spread area . For the remaining 40 GLs , as the inventory details ( base year 2011 ) are not available and monitoring data being available only since 2022 , the change detection in water spread area has been calculated as the * Difference between the current area of lake and last three years average area ( 2022 - 2024 ) For the 1941 Glacial Lakes being newly monitored from the year 2025 , the change detection in water spread area has been calculated as the

* Difference between the current area of lake and base year area (2021; as per Glacial Lake Atlas 2023)

Thereafter the GLs & WBs are categorized as those with increase in water spread area greater than 40%, increase in water spread area up to 40%, no change in water spread area, decrease in water spread area and analysis not performed due to limitations in remote sensing technology such as cloud cover, frozen condition, dried up condition etc.

The detailed flow-chart on methodology for automatic monitoring of Glacial Lakes and Water Bodies using satellite images is given below in Figure 3.1

**4. Results**

**4.1 Results of Monitoring of 902 Glacial Lakes & Water Bodies**

The water spread area of 902 Glacial Lakes & Water Bodies was calculated for the month of August 2025 in an automatic manner and manually digitized wherever required using the methodology described above. It includes **477 GL & WBs** with water spread area greater than 50ha which are being monitored since the year 2011 and **425 GLs** with water spread area between 10 Ha to 50 ha being monitored from the year 2022.

The results of change detection in water spread area of 477 GL & WBs are shown in **Table 4.1** to **Table 4.5.**

It is observed that out of **477 GL&WBs**,

i. **13** show increase in water spread area greater than 40%

ii. **218** show increase in water spread area but less than 40%

iii. **15** show no change in water spread area

iv. **211** show decrease in water spread area

v. change detection for remaining **20** could not be performed due to reasons such as like frozen condition, dried up condition, cloud cover etc.

The outcome of monitoring of **477 GLs & WBs (being monitored since 2011)** is shown in **Figure.4.1.**


Document: Monitoring Report Aug 2025
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Figure: Figure 4.1: Outcome of Monitoring of 477 GLs & WBs (being monitored since 2011), August 2025

**Figure 4.1: Outcome of Monitoring of 477 GLs & WBs (being monitored since 2011), August 2025**


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It was observed that out of **425 Glacial Lakes**,

i. **9** shows increase in water spread area greater than 40%

ii. **194** show increase in water spread area but less than 40%

iii. **8** show no change in water spread area

iv. **180** show decrease in water spread area

v. change detection for remaining **34** could not be performed due to reasons such as like frozen condition, dried up condition, cloud cover etc.

The outcome of monitoring of **425 GLs (being monitored since 2022)** is shown in **Figure.4.2.**


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Figure: Figure 4.2: Outcome of Monitoring of 425 GLs (being monitored since 2022), August 2025

**Figure 4.2: Outcome of Monitoring of 425 GLs (being monitored since 2022), August 2025**


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The results of change detection in water spread area of remaining **425 GLs** are shown in **Table 4.6** and **Table 4.7.**

The combined outcome of monitoring of 902 GLs & WBs is shown in **Figure.4.3.**


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Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
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Figure: Figure 4.3: Combined Outcome of Monitoring of 902 GLs & WBs, August 2025

**Figure 4.3: Combined Outcome of Monitoring of 902 GLs & WBs, August 2025**


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**4.2 100 Glacial Lakes located in India requiring vigorous monitoring (Out of 902 GLs&WBs)**

Out of the 902 GLs & WBs monitored, 100 Glacial Lakes (15 GLs>50 Ha & 85GLs – 10 to 50 Ha) are located in India. The analysis indicates that

Out of 15 GLs

(i) **8** show increase in water spread area
(ii) **6** show decrease in water spread area
(iii) change detection of **1** GL could not be performed

Out of 85 GLs

(i) **46** show increase in water spread area
(ii) **30** show decrease in water spread area
(iii) **2** shows no change in water spread area
(iv) change detection of **7** GL could not be performed

The results of change detection in water spread area of 15 GLs (>50Ha) and 85 GLs (10ha-50ha) are shown in **Table 4.8** and **Table 4.9** respectively.

The state-wise distribution of Glacial Lakes located in India analyzed for the month of August 2025 is shown in **figure 4.4. The lakes showing increase in water spread demand vigorous monitoring.**


Document: Monitoring Report Aug 2025
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Figure: Figure 4.4: State-wise distribution of Outcome of monitoring of 100 GLs within India (out of 902 GLs &WBs ), August 2025

**Figure 4.4: State-wise distribution of Outcome of monitoring of 100 GLs within India (out of 902 GLs &WBs ), August 2025**


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**4.3 Results of Monitoring of 1941 Glacial Lakes as per Glacial Lake Atlas 2023**

**4.3.1 Results of 581 Glacial Lakes located in India (Glacial Lake Atlas 2023)**

It is observed that out of 581GLs located in India,

i. **14** show increase in water spread area greater than 40%

ii. **360** show increase in water spread area but less than 40%

iii. **25** show no change in water spread area

iv. **119** show decrease in water spread area

v. change detection for remaining **63** could not be performed due to reasons such as like frozen condition, dried up condition, cloud cover etc.

The outcome of monitoring of **581 GLs located in India (being monitored from 2025)** is shown in **Figure.4.5.**


Document: Monitoring Report Aug 2025
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Figure: Figure 4.5: Outcome of Monitoring of 581 GLs located in India (being monitored from 2025) for the month of August 2025

**Figure 4.5: Outcome of Monitoring of 581 GLs located in India (being monitored from 2025) for the month of August 2025**


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The results of change detection in water spread area of remaining **581 GLs** located in India are shown in **Table 4.10**.

**4.3.2 Results of 1360 Glacial Lakes located in India (Glacial Lake Atlas 2023)**

It is observed that out of 1360 GLs located in Transboundary Region,

i. **46** show increase in water spread area greater than 40%
ii. **673** show increase in water spread area but less than 40%
iii. **71** show no change in water spread area
iv. **457** show decrease in water spread area
v. change detection for remaining **113** could not be performed due to reasons such as like frozen condition, dried up condition, cloud cover etc

The outcome of monitoring of **1360 GLs located transboundary (being monitored from 2025)** is shown in Figure.4.6.


Document: Monitoring Report Aug 2025
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Figure: Figure 4.6: Outcome of Monitoring of 1360 GLs located transboundary (being monitored from 2025) for the month of August 2025

**Figure 4.6: Outcome of Monitoring of 1360 GLs located transboundary (being monitored from 2025) for the month of August 2025**


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The combined outcome of monitoring of 1941 GLs as per Glacial lake Atlas 2023, being monitored from 2025 is shown in Figure.4.7.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
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Figure: Figure 4.7: Combined Outcome of Monitoring of 1941 GLs as per Glacial Lake Atlas 2023 for the month of August 2025

**Figure 4.7: Combined Outcome of Monitoring of 1941 GLs as per Glacial Lake Atlas 2023 for the month of August 2025**


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The results of change detection in water spread area of remaining 1360 GLs located transboundary are shown in Table 4.11.

**4.4 Glacial Lakes located in India requiring vigorous monitoring as per Glacial lake Atlas 2023**

Out of the 1941 Glacial Lakes monitored as per Glacial Lake Atlas 2023, 581GLs are located in India. The state-wise distribution of these Glacial Lakes analyzed for the month of August 2025 is shown in figure 4.8. The lakes showing increase in water spread demand vigorous monitoring.


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
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Figure: Figure 4.8: State-wise distribution of Outcome of monitoring of 581 GLs within India (as per Glacial Lake Atlas 2023), August 2025

**Figure 4.8: State-wise distribution of Outcome of monitoring of 581 GLs within India (as per Glacial Lake Atlas 2023), August 2025**


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The results of state-wise change detection in water spread area of 581 GLs located in India are shown in Table 4.12.

**4.5 Results of total 2843 GLs & WBs monitored by CWC**

Out of 2843 GLs & WBs monitored, 1435 show increase in area, 1008 show decrease in area, 108 show no change in area and 292 were no able to be anaysed from remote sensing data, during the month of August 2025.

The combined outcome of monitoring 2843 GLs & WBs is shown in Figure. 4.9.

**4.6 Combined State-wise Results of total 681 Glacial lakes located in India**

The state-wise distribution of combined outcome of monitoring of 681 Glacial Lakes located in India is shown in Figure. 4.10.


Document: Monitoring Report Aug 2025
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Figure: Figure 4.9: Combined Outcome of Monitoring total 2843 GLs & WBs, August 2025

**Figure 4.9: Combined Outcome of Monitoring total 2843 GLs & WBs, August 2025**


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011
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Figure: Figure 4.10: State-wise distribution of Combined Outcome of Monitoring of total 681 GLs located in India, August 2025

**Figure 4.10: State-wise distribution of Combined Outcome of Monitoring of total 681 GLs located in India, August 2025**


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**5.0 Conclusion**

**5.1. Conclusion on Monitoring of 902 GLs & WBs of Indian Himalayan Region**
* **12 Water Bodies and 1 Glacial Lake** (>50Ha area) show increase in area greater than 40% when change detection was carried out with respect to base year area(2011), average area of last 5 years(2020-2024) & average area of last 10 years(2015-2024). These Glacial lake and Water Bodies are located in China.
* 26 nos. of Glacial Lakes & Water Bodies have been merged to 13 nos. of Glacial Lakes & Water Bodies & combined area of merged glacial lakes and water bodies has been shown against respective glacial lakes and water bodies. However, merging and demerging of lakes is a dynamic process; hence figure of 902 Glacial Lakes & Water Bodies has been kept intact for analysis part. Details of merged Glacial Lakes & Water Bodies are as under.


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Table

| Sl. No. | ID | GL/WB | Location | Remarks |
| :--- | :--- | :--- | :--- | :--- |
| 1 | 03_71G_008 | WB | China | Merged with nearby lake not in inventory 2011 |
| 2 | 03_71K_011 | WB | China | Merged with nearby lake not in inventory 2011 |
| 3 | 03_82N_032 | GL | China | Merged with nearby lake not in inventory 2011 |
| 4 | 03_62O_040 | WB | China | Merged with nearby lake not in inventory 2011 |
| 5 | 01_61C_014 | WB | China | Merged with each other |
| | 01_61C_015 | WB | | |
| 6 | 03_78E_009 | WB | China | Merged with each other |
| | 03_78E_010 | WB | | |
| 7 | 03_62O_041 | WB | China | Merged with each other |
| | 03_62O_042 | WB | | |
| 8 | 03_71K_007 | WB | China | Merged with each other |
| | 03_71K_009 | WB | | |
| 9 | 03_91C_035 | GL | China | Merged with each other |
| | 03_91C_036 | GL | | |
| 10 | 02_71P_018 | WB | China | Merged with each other |
| | 02_71P_019 | GL | | |
| | 02_71P_020 | GL | | |
| 11 | 03_77L_048 | GL | China | Merged with each other |
| | 03_77L_053 | GL | | |
| 12 | 01_61C_002 | WB | China | Merged with each other |
| | 01_61C_004 | WB | | |
| | 01_61C_005 | WB | | |
| | 01_61C_010 | WB | | |
| | 01_61C_011 | WB | | |
| 13 | 01_52H_003 | GL | India (Himachal Pradesh) | Merged with each other |
| | 01_52H_004 | GL | | |


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The details of these lakes are given as footnote under Table Nos 4.1 to 4.6.

* **9 Glacial Lakes (10 ha-50 Ha area)** show increase in area greater than 40% when change detection was carried out with respect to base year area (2011), average area of last 3 years (2022-2024). 7 GLs are located in China. The remaining 2 Glacial lakes are located in India **(Jammu & Kashmir- 1 No. & Sikkim – 1 No.)**.
* The total Inventory area of **Glacial Lakes and Water Bodies** was 5,30,654 Ha during the year 2011 which has increased to 5,79,700 Ha during the year 2025 (August). There is a **9.24%** increase in area. *(Out of 902 GsL&WBs, only 798 GLs&WBs were considered for this interpretation. The remaining lakes include 40 SDC lakes which have no inventory details as well as GLs/WBs which were not analyzed/have been merged during the month of August, 2025.)* This is shown in Figure below.

* The total Inventory area of **Glacial Lakes** was 19,848 Ha during the year 2011 which has increased to 23,536 Ha during the year 2025 (August). There is a **18.58%** increase in area. *(Out of 544 GLs, only 465 GLs were considered for this interpretation. The remaining lakes include 40 SDC lakes which have no inventory details as well as lakes which were not analyzed/ have been merged during the month of August, 2025.)*. This is shown in Figure below.

* The total Inventory area of **Glacial Lakes within India** was 1,995 Ha during the year 2011 which has increased to 2,445 Ha during the year 2025 (August). There is a **22.56%** increase in area. *(Out of 100GLs, only 55 GLs were considered for this interpretation. The remaining lakes include 40 SDC lakes which have no inventory details as well as lakes which were not analysed/have been merged during the month of August, 2025.)*. This is shown in Figure below.

* **54 Glacial Lakes** (out of 100) located within India, as shown below, display increase in water spread area during the month of August 2025, and hence **demand vigorous monitoring for disaster purpose** *(Ladhak-5, Jammu & Kashmir-6, Himachal Pradesh-10, Uttarakhand- 4, Sikkim – 24 & Arunachal Pradesh-5)*.


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Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
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* The total Inventory area of newly monitored **Glacial Lakes within India as per Glacial Lake Atlas, 2023** was 12,939 Ha in the year 2021 which has increased to 13,260 Ha during the year 2025 (August). There is a **5.26%** increase in area. *(Out of 581GLs, only 518 GLs were considered for this interpretation. The remaining lakes were not able to be analysed during the month of August, 2025.)*. This is shown in Figure below.

* The total Inventory area of newly monitored **Glacial Lakes located in transboundary region as per Glacial Lake Atlas, 2023** was 43,723 Ha in the year 2021 which has increased to 45,862 Ha during the year 2025 (August). There is a **4.89%** increase in area. *(Out of 1360 GLs, only 1247 GLs were considered for this interpretation. The remaining lakes were not able to be analysed during the month of August, 2025.)*. This is shown in Figure below.

* **374 Glacial Lakes** (out of 581) located within India as per Glacial Lake Atlas 2023, as shown below, display increase in water spread area during the month of August 2025, and hence **demand vigorous monitoring for disaster purpose** *(Ladhak-128, Jammu & Kashmir-44, Himachal Pradesh-3, Uttarakhand- 3, Sikkim – 20 & Arunachal Pradesh-176)*.

**5.3 Conclusion on Combined Monitoring of 2843 Glacial lakes being monitored by CWC**

* **428 Glacial Lakes** (out of 681) located within India as per Glacial Lake Atlas 2023, as shown below, display **increase in water spread area during the month of August 2025**, and hence **demand vigorous monitoring for disaster purpose** *(Ladhak-133, Jammu & Kashmir-50, Himachal Pradesh-13, Uttarakhand- 7, Sikkim – 44 & Arunachal Pradesh-181)*.
* Use of a combination of Microwave satellite images in conjunction with multispectral satellite images (MSI) has largely overcome the short-comings due to obscurity from cloud cover and this has led to almost all-time and all-weather monitoring of all Glacial lakes & Water Bodies. This has increased availability of satellite images at shorter frequency interval and will facilitate in reducing the monitoring interval in future.
* The use of Sentinel satellite images has brought the improvement of spatial resolution from 56m to10m leading to enhancement of monitoring accuracy. Sentinel images have also aided in improving temporal resolution.
* Most of GLs & WBs exhibiting 40% or more increase in water spread area, are located in transboundary region.


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Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
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Table: Table 4.1: Results of Analysis of GLs & WBs with water spread area greater than 50 ha showing “More than 40% Increase” in area

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | 03_71K_007 | NRSC | CH_430 | 4752 | WB | 29°34'46.2" | 86°15'39.6" | Brahmaputra | | China | 907 | 99 | 163 | 123 | 455 |
| 2 | 03_78E_010 | NRSC | CH_606 | 4582 | WB | 27°57'48.96" | 89°24'45.72" | Brahmaputra | | China | 235 | 49 | 50 | 47 | 366 |
| 3 | 01_61C_010 | NRSC | CH_38 | 4495 | WB | 33°43'28.92" | 80°41'25.08" | Indus | Indus | China | 3140 | 88 | 725 | 446 | 333 |
| 4 | 02_71P_019 | NRSC | CH_207 | 4199 | GL | 28°21'8.64" | 87°52'30.36" | Ganga | Arun Kosi | China | 299 | 48 | 79 | 73 | 281 |
| 5 | 03_71K_009 | NRSC | CH_432 | 4750 | WB | 29°33'26.28" | 86°15'58.68" | Brahmaputra | | China | 907 | 230 | 271 | 240 | 235 |
| 6 | 01_61C_005 | NRSC | CH_33 | 4495 | WB | 33°44'54.96" | 80°38'29.76" | Indus | Indus | China | 3140 | 139 | 970 | 622 | 224 |
| 7 | 01_61C_014 | NRSC | CH_42 | 4279 | WB | 33°29'57.12" | 80°20'60" | Indus | Indus | China | 1110 | 286 | 360 | 333 | 208 |
| 8 | 03_62O_042 | NRSC | CH_387 | 4964 | WB | 29°29'56.04" | 83°25'40.44" | Brahmaputra | | China | 294 | 57 | 96 | 77 | 205 |
| 9 | 01_61C_011 | NRSC | CH_39 | 4494 | WB | 33°43'13.44" | 80°43'16.68" | Indus | Indus | China | 3140 | 403 | 1091 | 790 | 188 |
| 10 | 01_61C_002 | NRSC | CH_30 | 4494 | WB | 33°45'3.96" | 80°35'51.72" | Indus | Indus | China | 3140 | 685 | 1287 | 1045 | 144 |
| 11 | 02_71P_018 | NRSC | CH_206 | 4199 | WB | 28°21'27.72" | 87°53'6.72" | Ganga | Arun Kosi | China | 299 | 51 | 125 | 91 | 139 |
| 12 | 03_71K_011 | NRSC | CH_434 | 4761 | WB | 29°28'32.88" | 86°13'50.88" | Brahmaputra | | China | 678 | 387 | 381 | 387 | 75 |
| 13 | 01_61D_001 | NRSC | CH_53 | 5593 | WB | 32°48'5.4" | 80°29'0.96" | Indus | Indus | China | 93 | 63 | 46 | 58 | 47 |


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Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
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*Note: “#” indicates frozen/ dried/cloud covered lakes. Inventory Area (in Ha) has been rounded off.*
*A Water Body of China of Lake ID: 03_71K_011 has have merged with a nearby lake. The combined area has been shown against the lake.*
*A Water Body of China of Lake ID: 03_62O_040 has have merged with a nearby lake. The combined area has been shown against the lake.*
*The Waterbodies of China of Lake ID : 01_61C_002, 01_61C_004, 01_61C_005, 01_61C_010 & 01_61C_011 have merged with each other and combined area has been shown against each lake.*
*The Waterbodies of China of Lake ID : 02_71P_018 has merged with nearby Glacial lakes of Lake ID: 02_71P_019 & Lake ID: 02_71P_020 and combined area has been shown against each lake.*
*The Waterbodies of China of Lake ID : 03_71K_007 &03_71K_009 have merged with each other and combined area has been shown against each lake*
*The Waterbodies of China of Lake ID : 03_62O_041 &03_62O_042 have merged with each other and combined area has been shown against each lake*
*The Waterbodies of China of Lake ID : 01_61C_014 &01_61C_015 have merged with each other and combined area has been shown against each lake*


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
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Table: Table 4.2: Results of Analysis of GLs & WBs with water spread area greater than 50 ha showing “Increase in area upto 40%”

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | 01_53A_001 | NRSC | HP_9 | 409 | WB | 31°59'21.84" | 76°3'1.44" | Indus | Beas | India | 25131 | 16946 | 17824 | 18029 | 39 |
| 2 | 02_71L_034 | NRSC | CH_188 | 5095 | GL | 28°2'0.96" | 86°29'46.32" | Ganga | Sun Kosi | China | 87 | 46 | 62 | 64 | 37 |
| 3 | 03_62O_041 | NRSC | CH_386 | 4963 | WB | 29°30'39.6" | 83°26'39.48" | Brahmaputra | | China | 294 | 206 | 217 | 217 | 35 |
| 4 | 03_78E_009 | NRSC | CH_605 | 4580 | WB | 27°57'37.08" | 89°23'47.04" | Brahmaputra | | China | 235 | 175 | 175 | 171 | 34 |
| 5 | 01_61C_015 | NRSC | CH_43 | 4280 | WB | 33°29'16.44" | 80°18'58.32" | Indus | Indus | China | 1110 | 742 | 838 | 812 | 33 |
| 6 | 03_62O_032 | NRSC | CH_377 | 5012 | WB | 29°41'21.48" | 83°11'24.36" | Brahmaputra | | China | 70 | 49 | 52 | 53 | 32 |
| 7 | 01_52D_001 | NRSC | HP_1 | 780 | WB | 32°36'52.92" | 76°1'53.76" | Indus | Ravi | India | 970 | 725 | 694 | 752 | 29 |
| 8 | 02_53K_001 | NRSC | UK_1 | 355 | WB | 29°34'10.2" | 78°45'46.8" | Ganga | Ramganga | India | 6720 | 3880 | 5368 | 5272 | 25 |
| 9 | 01_53A_002 | NRSC | HP_10 | 495 | WB | 31°23'7.8" | 76°32'6" | Indus | Sutlej | India | 14450 | 10256 | 10429 | 11637 | 24 |
| 10 | 03_78A_021 | NRSC | SK_26 | 5431 | GL | 27°49'28.2" | 88°14'57.12" | Brahmaputra | Teesta | India | 100 | 56 | 81 | 62 | 23 |
| 11 | 03_77L_008 | NRSC | CH_524 | 4448 | WB | 28°49'31.8" | 90°41'11.04" | Brahmaputra | | China | 88 | 71 | 59 | 72 | 23 |
| 12 | 01_43G_001 | NRSC | JK_67 | 346 | WB | 33°12'47.16" | 73°42'41.76" | Indus | Jhelum | India | 27870 | 14989 | 21287 | 22652 | 23 |
| 13 | 02_72M_016 | NRSC | NP_92 | 4572 | GL | 27°47'54.6" | 87°5'33.36" | Ganga | Arun Kosi | Nepal | 258 | 161 | 211 | 185 | 22 |
| 14 | 02_71P_025 | NRSC | CH_213 | 4807 | WB | 28°12'51.12" | 87°28'5.88" | Ganga | Arun Kosi | China | 164 | 104 | 135 | 135 | 22 |
| 15 | 03_71G_001 | NRSC | CH_410 | 5163 | WB | 29°53'34.08" | 85°14'49.56" | Brahmaputra | | China | 906 | 720 | 747 | 744 | 21 |
| 16 | 03_82O_047 | NRSC | CH_1039 | 3574 | WB | 29°9'46.08" | 95°29'27.6" | Brahmaputra | Dihang | China | 58 | 44 | 48 | 43 | 21 |
| 17 | 01_43M_003 | NRSC | JK_120 | 2663 | WB | 35°13'54.84" | 75°37'49.44" | Indus | Shigar (Indus) | India | 268 | 187 | 218 | 223 | 20 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2023 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18 | 02_71L_004 | NRSC | CH_159 | 5518 | GL | 28°23'40.92" | 86°22'45.12" | Ganga | Arun Kosi | China | 142 | 79 | 118 | 114 | 20 |
| 19 | 02_53P_003 | NRSC | UK_11 | 207 | WB | 28°54'3.6" | 79°37'22.8" | Ganga | Ramganga | India | 1298 | 1078 | 850 | 867 | 20 |
| 20 | 03_62O_030 | NRSC | CH_375 | 5013 | WB | 29°43'34.68" | 83°6'16.56" | Brahmaputra | | China | 124 | 97 | 101 | 104 | 19 |
| 21 | 03_78E_007 | NRSC | BH_60 | 5008 | GL | 27°56'29.04" | 89°55'48" | Brahmaputra | Puna Tsang Chhu | Bhutan | 74 | 61 | 62 | 61 | 19 |
| 22 | 03_77L_009 | NRSC | CH_525 | 4515 | WB | 28°47'21.12" | 90°53'38.76" | Brahmaputra | | China | 650 | 522 | 539 | 549 | 18 |
| 23 | 03_77D_005 | NRSC/ SDC | SK_5 | 5249 | GL | 28°0'32.76" | 88°41'52.44" | Brahmaputra | Teesta | India | 118 | 88 | 100 | 91 | 18 |
| 24 | 03_77H_018 | NRSC | CH_488 | 4699 | WB | 28°10'50.52" | 89°32'3.84" | Brahmaputra | | China | 98 | 80 | 83 | 83 | 18 |
| 25 | 03_62K_009 | NRSC | CH_313 | 5079 | GL | 29°50'25.8" | 82°47'0.6" | Brahmaputra | | China | 348 | 250 | 290 | 297 | 17 |
| 26 | 01_52J_009 | NRSC | JK_205 | 5576 | WB | 34°9'2.16" | 78°33'11.52" | Indus | Shyok | India | 67 | 57 | 57 | 57 | 17 |
| 27 | 03_77D_003 | NRSC | SK_3 | 5098 | WB | 28°0'47.52" | 88°45'20.88" | Brahmaputra | Teesta | India | 113 | 84 | 98 | 95 | 16 |
| 28 | 01_43J_004 | NRSC | JK_82 | 4078 | WB | 34°55'15.24" | 74°31'14.88" | Indus | Jhelum | India | 78 | 59 | 66 | 67 | 16 |
| 29 | 03_78I_023 | NRSC | BH_104 | 5055 | GL | 27°56'22.56" | 90°32'5.28" | Brahmaputra | Manas Chhu & Mangde Chhu | Bhutan | 62 | 51 | 54 | 50 | 16 |
| 30 | 01_52K_014 | NRSC | JK_222 | 4535 | WB | 33°15'6.84" | 78°2'34.44" | Indus | Indus | India | 492 | 405 | 427 | 422 | 15 |
| 31 | 03_82O_016 | NRSC | CH_1023 | 4374 | WB | 29°22'19.56" | 95°52'18.48" | Brahmaputra | Dihang | China | 105 | 91 | 92 | 81 | 15 |
| 32 | 02_78A_004 | NRSC | CH_270 | 5603 | GL | 27°55'58.08" | 88°4'0.48" | Ganga | Arun Kosi | China | 124 | 84 | 109 | 108 | 14 |
| 33 | 03_77P_023 | NRSC | CH_593 | 4235 | WB | 28°1'55.56" | 91°0'6.12" | Brahmaputra | Kuri Chhu | China | 81 | 45 | 71 | 65 | 14 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2023 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 34 | 01_61F_004 | NRSC | CH_61 | 4814 | WB | 34°1'19.92" | 81°36'47.88" | Indus | Indus | China | 43854 | 36392 | 38538 | 38466 | 14 |
| 35 | 02_71P_043 | NRSC | CH_231 | 5206 | GL | 28°5'36.6" | 87°38'15" | Ganga | Arun Kosi | China | 89 | 67 | 79 | 77 | 13 |
| 36 | 03_82O_061 | NRSC | AP_54 | 3811 | WB | 29°0'40.32" | 95°53'5.64" | Brahmaputra | Dibang | India | 64 | 54 | 56 | 52 | 13 |
| 37 | 01_61C_016 | NRSC | CH_44 | 4289 | WB | 33°25'58.44" | 80°27'59.76" | Indus | Indus | China | 410 | 344 | 362 | 366 | 12 |
| 38 | 02_72I_004 | NRSC | CH_244 | 5074 | GL | 27°56'45.96" | 86°26'47.4" | Ganga | Sun Kosi | China | 217 | 121 | 190 | 193 | 12 |
| 39 | 01_52H_004 | NRSC | HP_5 | 4155 | GL | 32°29'47.04" | 77°33'5.76" | Indus | Chenab | India | 173 | 46 | 154 | 146 | 12 |
| 40 | 02_62F_019 | NRSC | NP_12 | 5039 | WB | 30°7'46.56" | 81°46'44.76" | Ganga | Karnali | Nepal | 74 | 58 | 64 | 66 | 12 |
| 41 | 01_43J_022 | NRSC | JK_100 | 1583 | WB | 34°7'11.28" | 74°49'50.52" | Indus | Jhelum | India | 70 | 60 | 63 | 62 | 12 |
| 42 | 02_71L_010 | NRSC | CH_165 | 5387 | GL | 28°20'54.96" | 86°13'30" | Ganga | Sun Kosi | China | 66 | 47 | 59 | 56 | 12 |
| 43 | 03_78E_002 | NRSC | BH_57 | 5110 | GL | 27°58'21" | 89°55'47.64" | Brahmaputra | Puna Tsang Chhu | Bhutan | 65 | 58 | 52 | 55 | 12 |
| 44 | 01_52J_005 | NRSC | JK_201 | 5430 | WB | 34°11'9.96" | 78°30'28.08" | Indus | Shyok | India | 49 | 44 | 43 | 43 | 12 |
| 45 | 01_61H_001 | NRSC | CH_66 | 4619 | WB | 32°7'7.68" | 81°16'9.84" | Indus | Indus | China | 330 | 282 | 278 | 298 | 11 |
| 46 | 03_62J_031 | NRSC | CH_303 | 4897 | GL | 30°6'14.04" | 82°16'10.56" | Brahmaputra | | China | 246 | 160 | 221 | 215 | 11 |
| 47 | 03_77L_010 | NRSC | CH_526 | 4457 | WB | 28°48'40.68" | 90°29'34.44" | Brahmaputra | | China | 52 | 47 | 45 | 44 | 11 |
| 48 | 01_52O_005 | NRSC | CH_8 | 4358 | WB | 33°23'25.08" | 79°22'1.2" | Indus | Indus | China | 877 | 780 | 794 | 776 | 10 |
| 49 | 01_61C_023 | NRSC | CH_51 | 4350 | WB | 33°5'57.48" | 80°10'38.64" | Indus | Indus | China | 705 | 623 | 644 | 618 | 10 |
| 50 | 02_78A_003 | NRSC | CH_269 | 5522 | GL | 27°56'46.68" | 88°4'30.72" | Ganga | Arun Kosi | China | 178 | 124 | 162 | 152 | 10 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 51 | 03_77D_002 | NRSC | SK_2 | 5156 | GL | 28°1'33.96" | 88°42'36" | Brahmaputra | Teesta | India | 116 | 104 | 105 | 100 | 10 |
| 52 | 02_71L_028 | NRSC | CH_183 | 5027 | GL | 28°8'8.88" | 86°31'45.48" | Ganga | Sun Kosi | China | 112 | 79 | 102 | 101 | 10 |
| 53 | 02_71D_004 | NRSC | NP_45 | 4064 | GL | 28°29'19.68" | 84°29'8.52" | Ganga | Trishuli | Nepal | 109 | 74 | 99 | 98 | 10 |
| 54 | 01_43K_010 | NRSC | JK_111 | 3946 | WB | 33°31'8.4" | 74°35'1.32" | Indus | Jhelum | India | 73 | 66 | 67 | 65 | 10 |
| 55 | 02_62K_012 | NRSC | NP_30 | 3653 | WB | 29°11'47.76" | 82°56'54.6" | Ganga | Bheri | Nepal | 520 | 469 | 478 | 476 | 9 |
| 56 | 02_71H_012 | NRSC | CH_132 | 5379 | GL | 28°33'49.68" | 85°36'14.76" | Ganga | Arun Kosi | China | 141 | 89 | 127 | 129 | 9 |
| 57 | 03_82N_004 | NRSC | CH_975 | 4290 | GL | 30°36'3.96" | 95°10'59.16" | Brahmaputra | | China | 137 | 92 | 126 | 118 | 9 |
| 58 | 02_71P_029 | NRSC | CH_217 | 5045 | GL | 28°10'42.24" | 87°33'41.4" | Ganga | Arun Kosi | China | 114 | 80 | 103 | 105 | 9 |
| 59 | 02_72M_007 | NRSC | CH_253 | 4950 | GL | 27°55'35.04" | 87°46'11.64" | Ganga | Arun Kosi | China | 108 | 94 | 99 | 96 | 9 |
| 60 | 02_71P_047 | NRSC | CH_235 | 5614 | GL | 28°4'9.48" | 87°2'53.88" | Ganga | Arun Kosi | China | 98 | 80 | 90 | 90 | 9 |
| 61 | 02_62J_003 | NRSC | NP_19 | 4854 | WB | 30°4'4.08" | 82°7'35.04" | Ganga | Karnali | Nepal | 62 | 49 | 56 | 57 | 9 |
| 62 | 03_62J_026 | NRSC | CH_298 | 5078 | GL | 30°15'21.6" | 82°12'34.2" | Brahmaputra | | China | 144 | 103 | 134 | 126 | 8 |
| 63 | 01_52H_002 | NRSC/SDC | HP_3 | 4101 | GL | 32°31'28.92" | 77°13'5.88" | Indus | Chenab | India | 106 | 62 | 98 | 94 | 8 |
| 64 | 03_91H_025 | NRSC | CH_1190 | 3741 | WB | 28°46'58.8" | 97°9'6.84" | Brahmaputra | Lohit | China | 92 | 85 | 81 | 85 | 8 |
| 65 | 02_72I_023 | NRSC | NP_76 | 5232 | GL | 27°46'59.16" | 86°57'24.84" | Ganga | Sun Kosi | Nepal | 88 | 81 | 70 | 74 | 8 |
| 66 | 03_91C_069 | NRSC | AP_101 | 3245 | WB | 29°3'3.6" | 96°8'40.2" | Brahmaputra | Dibang | India | 84 | 78 | 76 | 76 | 8 |
| 67 | 02_72M_005 | NRSC | CH_251 | 5141 | GL | 27°56'57.12" | 87°55'51.96" | Ganga | Arun Kosi | China | 80 | 71 | 74 | 72 | 8 |
| 68 | 03_82J_005 | NRSC | CH_835 | 4134 | GL | 30°37'34.68" | 94°26'42" | Brahmaputra | | China | 80 | 67 | 74 | 72 | 8 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 69 | 01_62F_010 | NRSC | CH_101 | 5250 | GL | 30°23'11.04" | 81°55'47.64" | Indus | Sutlej | China | 71 | 45 | 66 | 64 | 8 |
| 70 | 03_82J_025 | NRSC | CH_855 | 4038 | WB | 30°0'17.64" | 94°23'1.68" | Brahmaputra | | China | 64 | 59 | 57 | 56 | 8 |
| 71 | 03_78E_028 | NRSC | BH_72 | 2161 | WB | 27°38'21.12" | 89°44'24.36" | Brahmaputra | Puna Tsang Chhu | Bhutan | 51 | 47 | 43 | 44 | 8 |
| 72 | 01_52H_005 | NRSC | HP_6 | 4286 | WB | 32°28'53.76" | 77°36'52.56" | Indus | Chenab | India | 49 | 45 | 45 | 44 | 8 |
| 73 | 03_62J_013 | NRSC | CH_285 | 4934 | WB | 30°25'8.04" | 82°18'7.92" | Brahmaputra | | China | 986 | 854 | 926 | 926 | 7 |
| 74 | 02_71L_003 | NRSC | CH_158 | 5324 | WB | 28°49'55.92" | 86°31'21" | Ganga | Arun Kosi | China | 288 | 258 | 268 | 270 | 7 |
| 75 | 03_77L_051 | NRSC | BH_22 | 4548 | GL | 28°5'31.2" | 90°17'60" | Brahmaputra | Puna Tsang Chhu | Bhutan | 169 | 143 | 157 | 158 | 7 |
| 76 | 01_62E_003 | NRSC | CH_78 | 5104 | WB | 31°27'30.24" | 81°5'26.52" | Indus | Indus | China | 164 | 136 | 152 | 153 | 7 |
| 77 | 03_62J_001 | NRSC | CH_273 | 5449 | WB | 30°52'49.8" | 82°51'33.12" | Brahmaputra | | China | 157 | 147 | 140 | 142 | 7 |
| 78 | 03_62J_032 | NRSC | CH_304 | 4857 | GL | 30°4'42.6" | 82°20'32.28" | Brahmaputra | | China | 94 | 81 | 88 | 88 | 7 |
| 79 | 03_82G_023 | NRSC | CH_784 | 4377 | WB | 29°30'45" | 93°37'11.64" | Brahmaputra | | China | 90 | 84 | 80 | 81 | 7 |
| 80 | 03_78A_013 | NRSC | SK_19 | 5470 | GL | 27°55'7.68" | 88°9'39.6" | Brahmaputra | Teesta | India | 89 | 67 | 78 | 83 | 7 |
| 81 | 02_72I_027 | NRSC | NP_80 | 4977 | GL | 27°45'17.28" | 86°57'28.8" | Ganga | Sun Kosi | Nepal | 88 | 82 | 78 | 76 | 7 |
| 82 | 03_82J_019 | NRSC | CH_849 | 3944 | GL | 30°5'49.56" | 94°16'10.92" | Brahmaputra | | China | 88 | 45 | 83 | 76 | 7 |
| 83 | 03_82K_020 | NRSC | CH_876 | 4364 | WB | 29°53'47.76" | 94°27'41.4" | Brahmaputra | | China | 87 | 77 | 81 | 80 | 7 |
| 84 | 03_82G_017 | NRSC | CH_778 | 4437 | WB | 29°32'32.28" | 93°49'49.44" | Brahmaputra | | China | 57 | 53 | 50 | 51 | 7 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: text

| 85 | 03_91D_009 | NRSC | AP_108 | 4037 | WB | 28°55'40.44" | 96°20'19.68" | Brahmaputra | Dibang | India | 50 | 47 | 47 | 44 | 7


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 86 | 01_61C_018 | NRSC | CH_46 | 4291 | WB | 33°22'1.2" | 80°33'11.16" | Indus | Indus | China | 2073 | 1779 | 1934 | 1947 | 6 |
| 87 | 03_77L_011 | NRSC | CH_527 | 4533 | WB | 28°45'34.92" | 90°50'49.2" | Brahmaputra | | China | 1285 | 1209 | 1173 | 1171 | 6 |
| 88 | 01_61D_004 | NRSC | CH_56 | 4991 | WB | 32°9'24.84" | 80°18'11.88" | Indus | Indus | China | 580 | 550 | 532 | 527 | 6 |
| 89 | 03_62O_039 | NRSC | CH_384 | 4555 | WB | 29°35'21.48" | 83°59'19.68" | Brahmaputra | | China | 308 | 236 | 290 | 278 | 6 |
| 90 | 03_77L_043 | NRSC | CH_552 | 5200 | GL | 28°5'21.84" | 90°47'18.6" | Brahmaputra | Kuri Chhu | China | 251 | 181 | 237 | 228 | 6 |
| 91 | 03_82J_014 | NRSC | CH_844 | 3703 | WB | 30°10'24.6" | 94°20'44.52" | Brahmaputra | | China | 195 | 183 | 179 | 178 | 6 |
| 92 | 01_62E_013 | NRSC | CH_88 | 5345 | WB | 31°14'29.4" | 81°41'9.96" | Indus | Indus | China | 176 | 166 | 158 | 160 | 6 |
| 93 | 03_71P_001 | NRSC | CH_448 | 5302 | WB | 28°49'56.64" | 87°33'36" | Brahmaputra | | China | 139 | 112 | 129 | 131 | 6 |
| 94 | 03_77D_004 | NRSC/ SDC | SK_4 | 5287 | GL | 28°0'25.56" | 88°42'46.08" | Brahmaputra | Teesta | India | 123 | 106 | 116 | 116 | 6 |
| 95 | 03_82F_007 | NRSC | CH_732 | 4801 | GL | 30°31'13.8" | 93°26'41.28" | Brahmaputra | | China | 123 | 115 | 114 | 116 | 6 |
| 96 | 03_71O_006 | NRSC | CH_442 | 4738 | WB | 29°33'21.6" | 87°1'39" | Brahmaputra | | China | 121 | 104 | 113 | 114 | 6 |
| 97 | 03_77K_015 | NRSC | CH_517 | 4455 | WB | 29°7'3.36" | 90°20'9.24" | Brahmaputra | | China | 119 | 108 | 110 | 112 | 6 |
| 98 | 03_77L_030 | NRSC | BH_12 | 5305 | GL | 28°16'43.32" | 90°13'32.88" | Brahmaputra | | Bhutan | 92 | 79 | 86 | 86 | 6 |
| 99 | 03_62J_015 | NRSC | CH_287 | 5207 | WB | 30°23'52.08" | 82°11'32.28" | Brahmaputra | | China | 88 | 70 | 80 | 83 | 6 |
| 100 | 03_77L_067 | NRSC | BH_35 | 5231 | GL | 28°2'17.88" | 90°21'50.4" | Brahmaputra | Manas Chhu & Mangde Chhu | Bhutan | 85 | 78 | 80 | 77 | 6 |
| 101 | 03_82B_015 | NRSC | CH_641 | 5124 | WB | 30°20'56.4" | 92°44'7.08" | Brahmaputra | | China | 84 | 75 | 80 | 79 | 6 |
| 102 | 03_77L_017 | NRSC | CH_533 | 5340 | WB | 28°23'8.52" | 90°19'9.12" | Brahmaputra | | China | 84 | 74 | 79 | 74 | 6 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 103 | 03_62N_017 | NRSC | CH_334 | 5454 | WB | 30°27'55.44" | 83°59'4.2" | Brahmaputra | | China | 83 | 77 | 77 | 79 | 6 |
| 104 | 03_78M_020 | NRSC | BH_195 | 4157 | WB | 27°50'15.72" | 91°36'18.36" | Brahmaputra | Dangme Chhu | Bhutan | 70 | 65 | 66 | 66 | 6 |
| 105 | 02_77D_008 | NRSC | CH_263 | 5285 | GL | 28°1'6.24" | 88°17'14.28" | Ganga | Arun Kosi | China | 50 | 45 | 47 | 47 | 6 |
| 106 | 03_82E_002 | NRSC | CH_720 | 5008 | WB | 31°7'53.4" | 93°10'36.48" | Brahmaputra | | China | 719 | 659 | 683 | 688 | 5 |
| 107 | 01_61B_003 | NRSC | CH_28 | 5074 | WB | 34°14'5.64" | 80°30'20.88" | Indus | Indus | China | 235 | 224 | 209 | 199 | 5 |
| 108 | 03_62N_021 | NRSC | CH_338 | 5432 | WB | 30°25'50.88" | 83°59'48.84" | Brahmaputra | | China | 208 | 197 | 182 | 189 | 5 |
| 109 | 01_62E_010 | NRSC | CH_85 | 5233 | WB | 31°16'26.76" | 81°35'41.64" | Indus | Indus | China | 164 | 156 | 147 | 152 | 5 |
| 110 | 02_71P_040 | NRSC | CH_228 | 4962 | WB | 28°6'50.04" | 87°39'19.08" | Ganga | Arun Kosi | China | 151 | 126 | 143 | 139 | 5 |
| 111 | 03_78I_051 | NRSC | BH_132 | 5074 | GL | 27°53'26.16" | 90°17'24.36" | Brahmaputra | Manas Chhu & Mangde Chhu | Bhutan | 124 | 103 | 118 | 111 | 5 |
| 112 | 03_77P_009 | NRSC | CH_580 | 5086 | WB | 28°32'46.68" | 91°31'31.8" | Brahmaputra | | China | 111 | 94 | 106 | 105 | 5 |
| 113 | 03_82G_045 | NRSC | CH_806 | 4523 | WB | 29°24'19.44" | 93°42'28.44" | Brahmaputra | | China | 75 | 71 | 71 | 69 | 5 |
| 114 | 03_77L_042 | NRSC | CH_551 | 5057 | GL | 28°5'56.4" | 90°44'23.28" | Brahmaputra | Kuri Chhu | China | 73 | 57 | 68 | 69 | 5 |
| 115 | 01_52J_002 | NRSC | JK_198 | 5359 | WB | 34°13'59.16" | 78°25'34.32" | Indus | Shyok | India | 70 | 67 | 60 | 59 | 5 |
| 116 | 01_61F_002 | NRSC | CH_59 | 5279 | WB | 34°17'55.32" | 81°12'5.4" | Indus | Indus | China | 62 | 59 | 52 | 51 | 5 |
| 117 | 03_82O_054 | NRSC | CH_1046 | 3311 | WB | 29°7'41.88" | 95°26'17.88" | Brahmaputra | Dibang | China | 54 | 51 | 48 | 49 | 5 |
| 118 | 03_91C_078 | NRSC | CH_1106 | 3694 | WB | 29°0'30.24" | 96°13'4.44" | Brahmaputra | Dibang | China | 50 | 48 | 45 | 44 | 5 |
| 119 | 01_61C_001 | NRSC | CH_29 | 4526 | WB | 33°57'12.6" | 80°54'12.96" | Indus | Indus | China | 12221 | 11154 | 11727 | 11563 | 4 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table: Table 4.3: Results of Analysis of GLs & WBs with water spread area greater than 50 ha showing “No Change” in area

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | 03_77L_001 | NRSC | CH_520 | 4443 | WB | 28°57'20.52" | 90°42'39.6" | Brahmaputra | | China | 55987 | 55435 | 55940 | 54927 | 0 |
| 2 | 02_71H_001 | NRSC | CH_121 | 4580 | WB | 28°53'32.28" | 85°35'8.52" | Ganga | Arun Kosi | China | 27166 | 26825 | 27085 | 26958 | 0 |
| 3 | 02_71H_017 | NRSC | CH_137 | 5314 | GL | 28°29'43.44" | 85°38'9.24" | Ganga | Arun Kosi | China | 495 | 493 | 489 | 483 | 0 |
| 4 | 03_77H_001 | NRSC | CH_476 | 4275 | WB | 28°49'46.92" | 89°51'6.48" | Brahmaputra | | China | 444 | 442 | 374 | 357 | 0 |
| 5 | 01_61C_012 | NRSC | CH_40 | 4282 | WB | 33°32'45.24" | 80°9'2.16" | Indus | Indus | China | 315 | 290 | 312 | 315 | 0 |
| 6 | 03_91C_029 | NRSC | CH_1078 | 4229 | WB | 29°14'15.72" | 96°49'25.32" | Brahmaputra | | China | 218 | 216 | 212 | 217 | 0 |
| 7 | 01_43A_001 | NRSC | JK_22 | 3641 | WB | 35°59'42" | 72°36'45.36" | Indus | Gilgit | India | 207 | 203 | 207 | 203 | 0 |
| 8 | 03_82B_007 | NRSC | CH_633 | 4964 | WB | 30°53'40.92" | 92°57'2.52" | Brahmaputra | | China | 205 | 199 | 205 | 205 | 0 |
| 9 | 03_82C_010 | NRSC | CH_665 | 4921 | WB | 29°46'44.04" | 92°23'17.16" | Brahmaputra | | China | 153 | 153 | 150 | 148 | 0 |
| 10 | 03_91C_034 | NRSC | AP_84 | 4288 | WB | 29°18'6.48" | 96°4'55.92" | Brahmaputra | Dibang | India | 146 | 134 | 146 | 136 | 0 |
| 11 | 03_62O_040 | NRSC | CH_385 | 4896 | WB | 29°34'56.64" | 83°21'20.16" | Brahmaputra | | China | 138 | 107 | 138 | 130 | 0 |
| 12 | 01_43E_023 | NRSC | JK_47 | 4155 | WB | 35°51'54" | 73°44'42.72" | Indus | Gilgit | India | 86 | 86 | 82 | 85 | 0 |
| 13 | 02_71L_026 | NRSC | CH_181 | 5057 | GL | 28°11'8.52" | 86°31'54.12" | Ganga | Sun Kosi | China | 65 | 59 | 64 | 65 | 0 |
| 14 | 03_82G_060 | NRSC | CH_821 | 4577 | WB | 29°17'13.92" | 93°44'10.68" | Brahmaputra | | China | 59 | 59 | 55 | 56 | 0 |
| 15 | 03_71C_003 | NRSC | CH_396 | 5412 | GL | 29°51'59.76" | 84°37'26.4" | Brahmaputra | | China | 50 | 47 | 48 | 50 | 0 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: text

*Note: “#” indicates frozen/ dried/cloud covered lakes. Inventory Area (in Ha) has been rounded off.*


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table: Table 4.4: Results of Analysis of GLs & WBs with water spread area greater than 50 ha showing “Decrease” in area

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | 03_77L_012 | NRSC | CH_528 | 5014 | WB | 28°33'58.68" | 90°23'47.04" | Brahmaputra | | China | 29078 | 28771 | 29398 | 29140 | -1 |
| 2 | 01_52L_001 | NRSC | JK_225 | 4523 | WB | 32°53'48.12" | 78°18'48.6" | Indus | Sutlej | India | 13965 | 14139 | 13957 | 14058 | -1 |
| 3 | 01_62J_001 | NRSC | CH_102 | 4784 | WB | 30°38'15.72" | 82°8'6.36" | Indus | Sutlej | China | 5753 | 5571 | 5817 | 5692 | -1 |
| 4 | 03_82J_020 | NRSC | CH_850 | 3852 | WB | 30°3'1.08" | 94°14'53.52" | Brahmaputra | | China | 434 | 439 | 414 | 422 | -1 |
| 5 | 03_62J_011 | NRSC | CH_283 | 5181 | WB | 30°28'6.6" | 82°3'33.12" | Brahmaputra | | China | 398 | 401 | 380 | 373 | -1 |
| 6 | 03_78M_003 | NRSC | CH_614 | 4459 | WB | 27°54'3.96" | 91°53'48.84" | Brahmaputra | Dangme Chhu | China | 211 | 207 | 208 | 213 | -1 |
| 7 | 02_72I_014 | NRSC | NP_67 | 4574 | GL | 27°51'41.04" | 86°28'35.04" | Ganga | Sun Kosi | Nepal | 168 | 134 | 170 | 168 | -1 |
| 8 | 01_43N_001 | NRSC | JK_128 | 4142 | WB | 34°59'28.32" | 75°14'9.96" | Indus | Shingo (Indus) | India | 126 | 127 | 124 | 125 | -1 |
| 9 | 03_82K_075 | NRSC | CH_931 | 4511 | WB | 29°31'3.36" | 94°7'14.88" | Brahmaputra | | China | 117 | 118 | 115 | 117 | -1 |
| 10 | 03_91C_059 | NRSC | CH_1089 | 4303 | WB | 29°5'30.12" | 96°12'39.24" | Brahmaputra | Dibang | China | 97 | 98 | 94 | 95 | -1 |
| 11 | 03_82F_020 | NRSC | CH_745 | 4110 | GL | 30°16'3" | 93°27'22.68" | Brahmaputra | | China | 70 | 71 | 69 | 69 | -1 |
| 12 | 02_72M_009 | NRSC | NP_86 | 4932 | GL | 27°52'13.08" | 87°52'3.36" | Ganga | Tamor Kosi | Nepal | 64 | 65 | 63 | 65 | -1 |
| 13 | 01_43N_032 | NRSC | JK_159 | 3595 | WB | 34°5'37.32" | 75°29'52.44" | Indus | Jhelum | India | 56 | 49 | 55 | 57 | -1 |
| 14 | 03_77L_014 | NRSC | CH_530 | 5289 | WB | 28°26'19.32" | 90°10'24.96" | Brahmaputra | | China | 47 | 48 | 42 | 46 | -1 |
| 15 | 03_82O_042 | NRSC | AP_49 | 3093 | WB | 29°10'36.48" | 95°36'56.16" | Brahmaputra | Dibang | India | 44 | 44 | 37 | 40 | -1 |
| 16 | 01_62F_001 | NRSC | CH_92 | 4571 | WB | 30°41'19.68" | 81°13'55.2" | Indus | Sutlej | China | 25313 | 25486 | 25086 | 24522 | -1 |
| 17 | 03_77P_006 | NRSC | CH_577 | 4616 | WB | 28°39'46.44" | 91°40'46.56" | Brahmaputra | | China | 4764 | 4566 | 4350 | 4868 | -2 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18 | 03_82F_004 | NRSC | CH_729 | 4508 | WB | 30°37'16.32" | 93°10'49.8" | Brahmaputra | | China | 687 | 692 | 700 | 698 | -2 |
| 19 | 03_77L_013 | NRSC | CH_529 | 5191 | WB | 28°26'56.04" | 90°15'24.84" | Brahmaputra | | China | 343 | 319 | 348 | 327 | -2 |
| 20 | 03_82J_017 | NRSC | CH_847 | 3829 | WB | 30°7'33.24" | 94°5'24" | Brahmaputra | | China | 277 | 282 | 276 | 278 | -2 |
| 21 | 01_52K_009 | NRSC | JK_217 | 4921 | WB | 33°27'51.48" | 78°36'39.24" | Indus | Shyok | India | 200 | 204 | 193 | 195 | -2 |
| 22 | 01_62F_004 | NRSC | CH_95 | 5493 | WB | 30°25'50.88" | 81°25'58.44" | Indus | Sutlej | China | 192 | 196 | 183 | 185 | -2 |
| 23 | 03_77P_005 | NRSC | CH_576 | 4619 | WB | 28°45'55.08" | 91°40'30" | Brahmaputra | | China | 115 | 112 | 118 | 114 | -2 |
| 24 | 03_82P_010 | NRSC | AP_67 | 1676 | WB | 28°8'53.16" | 95°56'35.88" | Brahmaputra | Dibang | India | 97 | 99 | 91 | 98 | -2 |
| 25 | 03_82A_003 | NRSC | CH_622 | 4896 | WB | 31°6'33.12" | 92°57'7.2" | Brahmaputra | | China | 97 | 99 | 90 | 91 | -2 |
| 26 | 03_82E_003 | NRSC | CH_721 | 5027 | WB | 31°6'12.96" | 93°8'36.6" | Brahmaputra | | China | 96 | 98 | 92 | 96 | -2 |
| 27 | 03_82A_007 | NRSC | CH_626 | 4911 | WB | 31°2'10.32" | 92°47'12.84" | Brahmaputra | | China | 93 | 85 | 95 | 94 | -2 |
| 28 | 03_82N_033 | NRSC | CH_1004 | 4357 | GL | 30°13'16.68" | 95°35'0.24" | Brahmaputra | | China | 87 | 89 | 84 | 84 | -2 |
| 29 | 03_82O_029 | NRSC | JK_197 | 5311 | GL | 29°18'17.64" | 95°38'20.4" | Indus | Shyok | India | 72 | 68 | 73 | 67 | -2 |
| 30 | 03_77L_035 | NRSC | BH_14 | 5486 | GL | 28°14'58.92" | 90°11'13.56" | Brahmaputra | | Bhutan | 67 | 68 | 60 | 59 | -2 |
| 31 | 01_43P_002 | NRSC | JK_167 | 669 | WB | 32°41'48.84" | 75°8'44.16" | Indus | Ravi | India | 55 | 52 | 54 | 56 | -2 |
| 32 | 03_78M_019 | NRSC | BH_194 | 4697 | WB | 27°50'49.92" | 91°34'59.88" | Brahmaputra | Dangme Chhu | Bhutan | 54 | 55 | 52 | 54 | -2 |
| 33 | 01_62E_015 | NRSC | CH_90 | 5415 | WB | 31°10'56.28" | 81°11'40.2" | Indus | Sutlej | China | 50 | 51 | 47 | 47 | -2 |
| 34 | 03_77L_029 | NRSC | CH_545 | 5451 | GL | 28°16'22.8" | 90°35'24.36" | Brahmaputra | Kuri Chhu | China | 48 | 45 | 44 | 49 | -2 |
| 35 | 03_82O_064 | NRSC | AP_57 | 3689 | WB | 29°3'41.76" | 95°15'45" | Brahmaputra | Dihang | India | 45 | 44 | 46 | 44 | -2 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 36 | 03_91H_017 | NRSC | CH_1182 | 4590 | WB | 28°52'37.2" | 97°21'19.44" | Brahmaputra | Lohit | China | 45 | 46 | 40 | 37 | -2 |
| 37 | 03_77L_003 | NRSC | CH_521 | 4434 | WB | 28°56'57.48" | 90°31'1.2" | Brahmaputra | | China | 3945 | 4065 | 3920 | 3968 | -3 |
| 38 | 03_77P_017 | NRSC | CH_588 | 4751 | WB | 28°17'49.92" | 91°56'44.52" | Brahmaputra | Dangme Chhu | China | 2268 | 2345 | 2234 | 2193 | -3 |
| 39 | 03_77H_008 | NRSC | CH_482 | 4570 | WB | 28°13'37.92" | 89°38'17.52" | Brahmaputra | | China | 1225 | 1268 | 1249 | 1198 | -3 |
| 40 | 03_62O_024 | NRSC | CH_369 | 4637 | WB | 29°51'26.64" | 83°15'5.76" | Brahmaputra | | China | 860 | 721 | 887 | 853 | -3 |
| 41 | 02_62P_003 | NRSC | NP_36 | 4937 | GL | 28°41'31.92" | 83°51'9" | Ganga | Trishuli | Nepal | 335 | 315 | 344 | 305 | -3 |
| 42 | 01_42H_001 | NRSC | JK_1 | 4292 | WB | 36°52'50.16" | 73°42'4.68" | Indus | Gilgit | India | 267 | 276 | 269 | 276 | -3 |
| 43 | 01_52K_012 | NRSC | JK_220 | 4695 | WB | 33°18'46.8" | 78°28'41.16" | Indus | Indus | India | 161 | 166 | 161 | 160 | -3 |
| 44 | 02_78A_005 | NRSC | CH_271 | 5376 | GL | 27°55'41.16" | 88°0'10.08" | Ganga | Arun Kosi | China | 118 | 89 | 107 | 121 | -3 |
| 45 | 01_52J_006 | NRSC | JK_202 | 5401 | WB | 34°10'23.88" | 78°26'16.08" | Indus | Shyok | India | 107 | 110 | 104 | 100 | -3 |
| 46 | 03_82O_044 | NRSC | CH_1037 | 3552 | WB | 29°10'46.92" | 95°29'6.72" | Brahmaputra | Dihang | China | 89 | 92 | 89 | 88 | -3 |
| 47 | 01_43N_030 | NRSC | JK_157 | 3799 | WB | 34°8'21.12" | 75°8'50.64" | Indus | Jhelum | India | 84 | 86 | 80 | 83 | -3 |
| 48 | 03_91D_107 | NRSC | AP_163 | 3769 | WB | 28°12'8.64" | 96°53'51.72" | Brahmaputra | Lohit | India | 65 | 67 | 64 | 63 | -3 |
| 49 | 03_91D_107 | NRSC | CH_1102 | 4258 | GL | 28°12'8.64" | 96°53'51.72" | Brahmaputra | Dibang | China | 65 | 67 | 64 | 63 | -3 |
| 50 | 03_83A_012 | NRSC | AP_77 | 4287 | WB | 27°31'6.6" | 92°2'2.4" | Brahmaputra | Dangme Chhu | India | 61 | 63 | 57 | 56 | -3 |
| 51 | 03_78A_009 | NRSC | SK_16 | 5044 | GL | 27°56'51.72" | 88°19'52.68" | Brahmaputra | Teesta | India | 60 | 55 | 61 | 62 | -3 |
| 52 | 02_77D_007 | NRSC | CH_262 | 5215 | GL | 28°1'23.88" | 88°21'16.2" | Ganga | Arun Kosi | China | 57 | 55 | 55 | 59 | -3 |
| 53 | 01_52C_003 | NRSC | JK_187 | 4512 | GL | 33°9'26.28" | 76°59'3.48" | Indus | Indus | India | 56 | 45 | 56 | 58 | -3 |

Dibang Dihang Gilgit Jhelum Kosi Lohit Shyok Teesta


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 54 | 02_71L_032 | NRSC | CH_187 | 5250 | GL | 28°2'40.2" | 86°30'49.32" | Ganga | Sun Kosi | China | 56 | 58 | 52 | 52 | -3 |
| 55 | 03_91C_070 | NRSC | CH_1098 | 4252 | WB | 29°2'37.32" | 96°11'36.6" | Brahmaputra | Dibang | China | 55 | 57 | 54 | 52 | -3 |
| 56 | 02_71P_027 | NRSC | CH_215 | 5389 | GL | 28°11'40.2" | 87°38'26.52" | Ganga | Arun Kosi | China | 51 | 49 | 49 | 52 | -3 |
| 57 | 03_62O_027 | NRSC | CH_372 | 4575 | WB | 29°48'47.16" | 83°39'15.48" | Brahmaputra | | China | 45 | 47 | 38 | 40 | -3 |
| 58 | 03_82G_050 | NRSC | CH_811 | 4734 | WB | 29°22'57.36" | 93°38'25.08" | Brahmaputra | | China | 43 | 44 | 39 | 39 | -3 |
| 59 | 03_77L_006 | NRSC | CH_522 | 4533 | WB | 28°53'40.2" | 90°24'19.44" | Brahmaputra | | China | 42 | 44 | 28 | 33 | -3 |
| 60 | 01_61C_022 | NRSC | CH_50 | 4339 | WB | 33°5'51.36" | 80°23'34.08" | Indus | Indus | China | 1570 | 1420 | 1635 | 1503 | -4 |
| 61 | 02_71P_015 | NRSC | CH_203 | 4153 | WB | 28°34'35.76" | 87°32'38.76" | Ganga | Arun Kosi | China | 1021 | 838 | 1067 | 991 | -4 |
| 62 | 01_52K_011 | NRSC | JK_219 | 5291 | WB | 33°25'38.64" | 78°29'16.44" | Indus | Shyok | India | 178 | 186 | 173 | 173 | -4 |
| 63 | 01_52K_010 | NRSC | JK_218 | 5313 | WB | 33°27'17.64" | 78°29'54.24" | Indus | Shyok | India | 147 | 152 | 143 | 140 | -4 |
| 64 | 03_78M_016 | NRSC | CH_617 | 4647 | WB | 27°50'30.84" | 91°53'34.44" | Brahmaputra | Dangme Chhu | China | 142 | 142 | 147 | 147 | -4 |
| 65 | 02_71H_007 | NRSC | CH_127 | 5149 | GL | 28°37'25.68" | 85°30'33.84" | Ganga | Arun Kosi | China | 120 | 125 | 116 | 120 | -4 |
| 66 | 03_82B_004 | NRSC | CH_630 | 4893 | WB | 30°56'56.04" | 92°53'22.56" | Brahmaputra | | China | 99 | 93 | 101 | 103 | -4 |
| 67 | 03_77J_003 | NRSC | CH_499 | 5039 | WB | 30°28'45.48" | 90°57'58.32" | Brahmaputra | | China | 85 | 89 | 84 | 85 | -4 |
| 68 | 03_82K_002 | NRSC | CH_858 | 3998 | WB | 29°59'14.64" | 94°26'7.44" | Brahmaputra | | China | 74 | 75 | 77 | 75 | -4 |
| 69 | 03_77H_012 | NRSC | CH_483 | 4723 | GL | 28°14'25.44" | 89°41'41.28" | Brahmaputra | | China | 73 | 76 | 69 | 75 | -4 |
| 70 | 03_82E_007 | NRSC | CH_725 | 5043 | WB | 31°0'14.4" | 93°5'16.08" | Brahmaputra | | China | 68 | 71 | 64 | 68 | -4 |
| 71 | 03_91H_011 | NRSC | CH_1176 | 4494 | WB | 28°56'43.44" | 97°5'53.16" | Brahmaputra | Lohit | China | 59 | 50 | 62 | 54 | -4 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2025 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last5 Years (ha) (ii) | Average Area of Last10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 72 | 03_82N_019 | NRSC | CH_990 | 4877 | WB | 30°28'24.6" | 95°34'30.36" | Brahmaputra | | China | 53 | 55 | 52 | 49 | -4 |
| 73 | 03_82K_006 | NRSC | CH_862 | 4523 | WB | 29°56'25.8" | 94°35'18.24" | Brahmaputra | | China | 50 | 52 | 46 | 47 | -4 |
| 74 | 03_77H_013 | NRSC | CH_484 | 4950 | GL | 28°12'32.04" | 89°44'42.72" | Brahmaputra | | China | 46 | 48 | 44 | 47 | -4 |
| 75 | 01_61C_021 | NRSC | CH_49 | 4349 | WB | 33°6'16.56" | 80°17'10.32" | Indus | Indus | China | 1094 | 1155 | 1150 | 1111 | -5 |
| 76 | 03_71G_013 | NRSC | CH_422 | 4543 | WB | 29°6'7.56" | 85°5'49.56" | Brahmaputra | | China | 242 | 244 | 244 | 254 | -5 |
| 77 | 02_72I_011 | NRSC | NP_64 | 5034 | GL | 27°53'58.2" | 86°55'15.96" | Ganga | Sun Kosi | Nepal | 158 | 107 | 167 | 153 | -5 |
| 78 | 03_78E_023 | NRSC | CH_612 | 5291 | GL | 27°51'17.64" | 89°15'59.76" | Brahmaputra | | China | 60 | 38 | 54 | 63 | -5 |
| 79 | 03_71C_005 | NRSC | CH_398 | 5551 | GL | 29°50'43.8" | 84°40'32.16" | Brahmaputra | | China | 54 | 57 | 49 | 53 | -5 |
| 80 | 03_78E_026 | NRSC | CH_613 | 5161 | GL | 27°48'31.32" | 89°13'37.2" | Brahmaputra | Amo Chhu | China | 52 | 36 | 51 | 55 | -5 |
| 81 | 03_78E_029 | NRSC | BH_73 | 4250 | WB | 27°38'37.68" | 89°27'39.96" | Brahmaputra | Puna Tsang Chhu | Bhutan | 43 | 45 | 38 | 36 | -5 |
| 82 | 01_52G_003 | NRSC | JK_191 | 4533 | WB | 33°18'38.52" | 77°59'49.2" | Indus | Indus | India | 1380 | 1473 | 1129 | 1230 | -6 |
| 83 | 03_62N_004 | NRSC | CH_321 | 5168 | WB | 30°40'5.16" | 83°37'30.72" | Brahmaputra | | China | 835 | 878 | 869 | 888 | -6 |
| 84 | 02_71H_027 | NRSC | CH_147 | 5242 | GL | 28°21'40.32" | 85°52'12.36" | Ganga | Sun Kosi | China | 473 | 501 | 451 | 435 | -6 |
| 85 | 02_62P_004 | NRSC | NP_37 | 807 | WB | 28°13'1.2" | 83°56'43.8" | Ganga | Trishuli | Nepal | 381 | 406 | 381 | 395 | -6 |
| 86 | 03_82D_004 | NRSC | CH_710 | 4481 | WB | 28°52'54.84" | 92°9'5.4" | Brahmaputra | | China | 367 | 390 | 371 | 376 | -6 |
| 87 | 03_78A_014 | NRSC/ SDC | SK_20 | 5234 | GL | 27°54'42.84" | 88°11'54.96" | Brahmaputra | Teesta | India | 140 | 123 | 150 | 141 | -6 |
| 88 | 02_71L_023 | NRSC | CH_178 | 5106 | GL | 28°11'50.64" | 86°34'54.12" | Ganga | Arun Kosi | China | 120 | 116 | 126 | 127 | -6 |
| 89 | 03_91C_045 | NRSC | AP_91 | 3493 | WB | 29°13'44.4" | 96°11'29.4" | Brahmaputra | Dibang | India | 106 | 113 | 104 | 107 | -6 |


Document: Monitoring Report Aug 2025
Section: 1. Introduction > 1.3 Inventory of Glacial Lakes & Water Bodies 2011 > 5.2 Conclusion on Monitoring of 1941 Glacial lakes being monitored from 2025 (as per Glacial Lake Atlas, 2023)
Type: table
Table

| Sl. No. | Lake ID (as per GLI 2011) | Inventory Developed by | UID | Elevation (m) | Lake Type | Lattitude(N) | Longitude(E) | Basin | River | Country | Area of August 2005 (Ha) | Area of Base Year of 2011 (ha) (i) | Average Area of Last 5 Years (ha) (ii) | Average Area of Last 10 years (ha) (iii) | Change in Area (%) w.r.t maximum of (i),(ii)&(iii) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 90 | 02_77D_006 | NRSC | CH_261 | 4894 | GL | 28°3'21.6" | 88°25'35.4" | Ganga | Arun Kosi | China | 94 | 80 | 87 | 100 | -6 |
| 91 | 02_77D_006 | NRSC | CH_1032 | 3345 | WB | 28°3'21.6" | 88°25'35.4" | Brahmaputra | Dihang | China | 94 | 80 | 87 | 100 | -6 |
| 92 | 03_91C_040 | NRSC | AP_87 | 4450 | WB | 29°15'19.08" | 96°14'40.92" | Brahmaputra | Lohit | India | 89 | 94 | 86 | 82 | -6 |
| 93 | 03_82K_074 | NRSC | CH_930 | 4553 | WB | 29°31'33.96" | 94°3'26.28" | Brahmaputra | | China | 83 | 88 | 77 | 81 | -6 |
| 94 | 01_43E_006 | NRSC | JK_30 | 4186 | WB | 35°56'43.08" | 73°21'52.56" | Indus | Gilgit | India | 67 | 71 | 66 | 68 | -6 |
| 95 | 03_82G_062 | NRSC | CH_823 | 4925 | WB | 29°14'25.08" | 93°16'33.6" | Brahmaputra | | China | 54 | 58 | 55 | 56 | -6 |
| 96 | 03_78M_010 | NRSC | BH_188 | 4496 | WB | 27°52'37.92" | 91°38'1.68" | Brahmaputra | Dangme Chhu | Bhutan | 47 | 50 | 41 | 42 | -6 |
| 97 | 03_82B_020 | NRSC | CH_646 | 4986 | WB | 30°12'59.04" | 92°30'59.76" | Brahmaputra | | China | 46 | 49 | 45 | 49 | -6 |
| 98 | 03_82F_014 | NRSC | CH_739 | 4691 | GL | 30°20'52.08" | 93°30'24.12" | Brahmaputra | | China | 46 | 49 | 43 | 44 | -6 |
| 99 | 01_52G_001 | NRSC | JK_189 | 5008 | WB | 33°59'57.12" | 77°58'44.04" | Indus | Shyok | India | 42 | 45 | 44 | 44 | -6 |
| 100 | 03_82J_004 | NRSC | CH_834 | 3957 | GL | 30°39'37.8" | 94°29'7.8" | Brahmaputra | | China | 502 | 356 | 542 | 533 | -7 |
| 101 | 01_52L_002 | NRSC | JK_226 | 4986 | WB | 32°58'54.84" | 78°35'43.44" | Indus | Indus | India | 412 | 442 | 423 | 419 | -7 |
| 102 | 02_71H_028 | NRSC | CH_148 | 5174 | WB | 28°19'49.08" | 85°52'7.32" | Ganga | Sun Kosi | China | 186 | 200 | 193 | 197 | -7 |
| 103 | 03_62N_022 | NRSC | CH_339 | 4599 | WB | 30°12'15.12" | 83°14'31.92" | Brahmaputra | | China | 184 | 198 | 186 | 187 | -7 |
| 104 | 01_43J_017 | NRSC | JK_95 | 3580 | WB | 34°25'55.56" | 74°55'27.12" | Indus | Jhelum | India | 153 | 164 | 157 | 157 | -7 |
| 105 | 01_52O_002 | NRSC | CH_5 | 5262 | WB | 33°58'49.08" | 79°32'35.52" | Indus | Indus | China | 125 | 135 | 96 | 105 | -7 |
| 106 | 03_91D_041 | NRSC | AP_135 | 3526 | WB | 28°46'32.52" | 96°31'53.4" | Brahmaputra | Dibang | India | 120 | 115 | 129 | 119 | -7 |
| 107 | 03_91C_038 | NRSC | AP_85 | 4002 | WB | 29°16'8.4" | 96°9'24.12" | Brahmaputra | Dibang | India | 105 | 113 | 95 | 93 | -7 |

Dibang Dihang Gilgit Jhelum Kosi Lohit Shyok