Watershed

noun

'wɔtər,ʃɛd

Noun

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”
Similar:Landmark
Type of:JunctureOccasion
the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
Similar:Basin
a ridge of land that separates two adjacent river systems
Similar:Divide
Type of:Line