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noun, Physical Geography.
the area of land drained by a river and its branches.
river basin
The land area that is drained by a river and its tributaries. The Mississippi River basin, for example, is a vast area that covers much of the central United States from the central ranges of the Appalachian Mountains in the east to the eastern ranges of the Rocky Mountains in the west, funneling toward its delta in southern Louisiana and emptying into the Gulf of Mexico.


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  • Riverboat

    noun 1. any shallow-draft boat used on rivers.

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