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Definition of watershed:

  1. The line of division between two adjacent rivers or lakes with respect to the flow of water by natural channels into them; the natural boundary of a basin.
  2. The whole region or extent of country which contributes to the supply of a river or lake.


drainage basin, corner, washstand, washbasin, turning point, basinful, lavatory, basin, drainage area, landmark, divide, street corner, river basin, catchment area, water parting, washbowl, territory, catchment basin.

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