River and Watershed Terminology

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Watershed

Back

An imaginary line separating one drainage basin from another

Front

River channel

Back

The area a river flows in, with banks on each side

Front

Source

Back

The point at which a river starts

Front

Drainage basin

Back

The area of land drained by a river

Front

Tributary

Back

A small river leading into a bigger river

Front

Confluence

Back

Where two rivers join together

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Mouth

Back

Where a river enters the sea