1. (noun) watershed, water parting, divide
a ridge of land that separates two adjacent river systems
Synonyms: river basin, drainage area, landmark, catchment area, watershed, drainage basin, catchment basin, divide, turning point, basin, water parting
2. (noun) river basin, basin, watershed, drainage basin, catchment area, catchment basin, drainage area
the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
Synonyms: washstand, divide, river basin, washbowl, washbasin, landmark, lavatory, drainage area, watershed, drainage basin, catchment basin, catchment area, turning point, basin, water parting, basinful
3. (noun) landmark, turning point, watershed
an event marking a unique or important historical change of course or one on which important developments depend
Synonyms: street corner, corner, river basin, drainage area, landmark, catchment area, watershed, drainage basin, catchment basin, divide, turning point, basin, water parting
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Synonyms for watershed 
