The area drained by a river is called a .

tributary

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river basin

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river mouth

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estuary

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Solution

The correct option is B river basin
The area drained by a river along with all its tributaries is called a catchment area or river basin. The Amazon river, as it flows through the region along with all its tributaries, drains a large area. This entire area that the Amazon drains is the largest river basin in the world. It is known as the Amazon river basin.

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