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

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 basinbasinwatershedcatchment areacatchment basindrainage area