river basin

noun Physical Geography.

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

Origin of river basin

First recorded in 1875–80

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for river basin

Historical Examples of river basin

The lower part of the river-basin was inhabited by the Angrivarii.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7
Various
Daniel sees a ram standing eastward of the river-basin of the Ulai, having two horns, of which one is higher than the other.
The Expositor's Bible: The Book of Daniel
F. W. Farrar
Lifting up his eyes, Daniel sees a ram standing eastward of the river-basin.
The Expositor's Bible: The Book of Daniel
F. W. Farrar
With these replaced, and the supplies of petrol and oil replenished, we flew south during the afternoon to the river-basin of war.
Cavalry of the Clouds
Alan Bott

river basin in Science

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.