1 文書を見つけるための辞書。

• catchment basin, catchment area, watershed, river basin, basin, drainage basin, drainage area
• 盆地, 流域面積, 流域
• 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"
• 川やその支流に排水される、地理上の領域全体