#watershed__water_parting__waterparting__divide  a line that divides two adjacent river systems
  supertype:  #line.location  a spatial location defined by a real or imaginary unidimensional extent
  instance:  #Great_Divide
  subtype:  #continental_divide__continentaldivide  the watershed of a continent (especially the watershed of North America formed by a series of mountain ridges)

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