| river basin n. The land area drained by a river and its tributaries. |
| 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  river basin - the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet; "flood control in the Missouri basin"detention basin - a storage site (such as a small reservoir) that delays the flow of water downstream retention basin - a storage site similar to a detention basin but the water in storage is permanently obstructed from flowing downstream geographic area, geographic region, geographical area, geographical region - a demarcated area of the Earth |
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