1. 流域; 流域盆地：流岩体 rheid | 流域;流域盆地 drainage basin | 流褶曲 flowage fold
2. 硫：drainage 排水 | drainage basin 硫 | draught 吃水
3. 集水区：drainage area 排水区 | drainage basin 集水区 | drainage density 排水密度
1. It's commonly accepted among the international geographical community that the source of a river is defined as the longest branch in the drainage basin.
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noun
1. the entire geographical area drained by a river and its tributaries
an area characterized by all runoff being conveyed to the same outlet
e.g. flood control in the Missouri basin
Synonym: river basin basin watershed catchment area catchment basin drainage area