River
type: Class
comment: A natural flowing watercourse

Geographic Feature
type: Class
comment: A natural or administrative geographic entity

US State
type: Class
comment: A US state

County
type: Class
comment: A county subdivision

Country
type: Class
comment: A country or nation

River System
type: Class
comment: A major river system or watershed

Elevation
type: Class
comment: An elevation measurement in meters

has source
type: ObjectProperty
comment: Relates a river to its source feature
domain: River
range: Geographic Feature

has mouth
type: ObjectProperty
comment: Relates a river to its terminus
domain: River
range: Geographic Feature

has tributary
type: ObjectProperty
comment: Relates a river to a tributary
domain: River
range: River

flows into
type: ObjectProperty
comment: Relates a river to another river it flows into
domain: River
range: River

traverses
type: ObjectProperty
comment: Relates a river to a US state it passes through
domain: River
range: US State

in county
type: ObjectProperty
comment: Relates a river to a county
domain: River
range: County

in country
type: ObjectProperty
comment: Relates a river to a country
domain: River
range: Country

part of river system
type: ObjectProperty
comment: Relates a river to a river system
domain: River
range: River System

drains into
type: ObjectProperty
comment: Relates a river to its drainage basin
domain: River
range: Geographic Feature

length
type: DatatypeProperty
comment: River length in meters
domain: River
range: double

discharge
type: DatatypeProperty
comment: Average discharge in cubic meters per second
domain: River
range: double

elevation
type: DatatypeProperty
comment: Elevation in meters
domain: Geographic Feature
range: double

source elevation
type: DatatypeProperty
comment: Source elevation in meters
domain: River
range: double

mouth elevation
type: DatatypeProperty
comment: Mouth elevation in meters
domain: River
range: double

abstract text
type: DatatypeProperty
comment: Descriptive text about the river
domain: River
range: string

other names
type: DatatypeProperty
comment: Alternative names for the river
domain: River
range: string