The Kennet and Avon canal.
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The join of a small river (a tributary) joins a larger river (the main river) is called a confluence.
a tributary
Other streams or lakes that joins a main river is a tributary
Tributary.
Its is called a tributary
Tributary.
Yes, the river Thames flows through Oxford
A Tributary.
The River Lea, or River Lee Navigation
The Arkansas River.
When a tributary joins a river, the river expands.
It is the Thames but in Oxford it is also called the Isis.