#col__gap  a pass between mountain peaks
  supertype:  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"
  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

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