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The join of a small river (a tributary) joins a larger river (the main river) is called a confluence.
Its is called a tributary
The small river acted as a tributary to the main channel.
A tributary is a small stream of water that feeds into a larger stream or into a lake. So the Ohio River is a tributary of the Mississippi River, the Little Miami River is a tributary of the Ohio River, and the Genessee River is a tributary of Lake Ontario.
A small river is a tributary to the larger river.
A Tributary
Tributary.
A tributary.
A tributary is a small waterway that flows into a river.
A small river flowing into a larger river.
A tributary is a stream or river which flows into a mainstream river. A tributary does not flow directly into a sea. An example being Walton Creek, a small tributary of the Lochsa River in north-eastern Idaho,
Tributary.