#mountain_pass__pass__notch  the location in a range of mountains of a geological formation that is lower than the surrounding peaks; "we got through the pass before it started to snow"
  supertype:  #location  a point or extent in space
  instance:  #Cumberland_Gap
  part of:  #range_of_mountains
  subtype:  #col__gap  a pass between mountain peaks
     subtype:  #water_gap  a pass in a mountain ridge through which a stream flows
     subtype:  #wind_gap  a pass in a mountain ridge with no stream flowing through it
  subtype:  #defile__gorge  a narrow pass (especially one between mountains)
  subtype:  #Khyber_Pass  a mountain pass of great strategic and commercial value in the Hindu Kush on the border between northern Pakistan and western Afghanistan; a route by which invaders entered India
  subtype:  #saddleback__saddle  a pass or ridge that slopes gently between two peaks (is shaped like a saddle)

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