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Watershed originally meant the dividing line between two drainage basins, from an old term shedding, meaning splitting or dividing. Some uses of the term keep this meaning, but in North American geographical usage watershed has come to mean the drainage basin itself.

• Watershed (in Britain and some other Commonwealth countries), a drainage water divide, the ridge of land that separates two adjacent drainage basins
• Watershed (in North American usage), a drainage basin or river catchment, a region of land whose water drains into a particular watercourse
• The European Watershed, the line dividing the drainage basins of the major rivers of Europe
• The Humber Watershed, a drainage basin of south-central Ontario, Canada
• Watersheds of Indiana, six distinct Indiana drainage basins draining into five major bodies of water
• Taunton River Watershed, a drainage basin in southeastern Massachusetts, USA.
• List of watersheds, a list of drainage basins
• Watershed management, the management of drainage basins

• Watershed (algorithm), an algorithm for image segmentation
• Watershed Area (medical), a region of the body with overlapping blood supply
• Watershed Stroke, an infarct of a portion of the brain with overlapping blood supply

• Watershed district, one of a number of government entities in the US state of Minnesota which monitor and regulate the use of water in drainage basins
• The Watershed Media Centre, a media and arts centre in Bristol, England.
• Watershed College, a school situated on the outskirts of Marondera town in Zimbabwe
• Santa Fe Watershed Association, a non-profit organization based in Santa Fe, New Mexico

• Watershed, a moment or event separating two distinct periods of time, a momentous event that alters the course of history
• Watershed (television), in Canada, Ireland, South Africa and the United Kingdom, a particular time of day before which program content of a specified or implied kind may not be screened and after which it is permissible
• Watershed (South African band), a South African band featuring lead singer Craig W Hinds
• Watershed (Columbus Ohio band), an American band based in Columbus, Ohio
• Watershed (album), a 2008 album by singer k d lang
• Watershed, a song by the Indigo Girls from the album Nomads Indians Saints

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