wa·ter·shed /ˈwɔtɚ/
 分水嶺


 Wa·ter·shed n.
 1. The whole region or extent of country which contributes to the supply of a river or lake.
 2. 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; -- called also divide and water parting.

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 watershed
      n 1: a ridge of land that separates two adjacent river systems
           [syn: water parting, divide]
      2: 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"
         [syn: landmark, turning point]