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(noun) landmark, turning point
an event marking a unique or important historical change of course or one on which important developments depend
the agreement was a watershed in the history of both nations
(noun) catchment area, catchment basin, basin, drainage area, drainage basin, river basin
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
(noun) water parting, divide
a ridge of land that separates two adjacent river systems