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Noun: watershed  'wo-tu(r),shed
  1. A ridge of land that separates two adjacent river systems
    - water parting, divide
  2. 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 watershed";
    - river basin, basin, drainage basin, catchment area, catchment basin, drainage area
  3. 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";
    - landmark, turning point, cusp

Derived forms: watersheds

Type of: geographic area, geographic region, geographical area, geographical region, juncture, line, occasion

Encyclopedia: Watershed, Bristol