river basin

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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
• Syn:
basin, watershed, drainage basin, catchment area, catchment basin, drainage area
• Hypernyms:
geographical area, geographic area, geographical region, geographic region
• Hyponyms:
detention basin, retention basin