River-basin
noun, Physical Geography.
1.
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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noun 1. any shallow-draft boat used on rivers.
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noun 1. the activity or sport of rafting down fast-flowing rivers on a small inflatable single-seat craft, a river bug, that resembles an armchair