Question

what is a drainage river basin​

Answer 1

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River Basin refers to the area which is in the grip of the river and the tributaries that flow through it .

OR

The term drainage describes the river system of an area. The area drained by a single river system is called a drainage basin.

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Answer 2

Answer:

A drainage basin is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water.