river basin

noun

Physical Geography.

1. the area of land drained by a river and its branches.

river basin

1. 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.

Word History and Origins

Origin of river basin¹

First recorded in 1875–80