River

A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it runs out of water, or only flow during certain seasons. Rivers are regulated by the water cycle, the processes by which water moves around the Earth.

Extends: Rivers, [Bodies of water](https://wikipedia.org.ai/Bodies of water), [Fluvial landforms](https://wikipedia.org.ai/Fluvial landforms), Geomorphology, Sedimentology