#basin.natural_depression  a natural depression in the surface of the land often with a lake at the bottom of it; "the basin of the Great Salt Lake"
  supertype:  #natural_depression__naturaldepression__depression  a sunken or depressed geological formation
  subtype:  #cirque__corrie__cwm  a steep-walled semicircular basin in a mountain; may contain a lake
  subtype:  #saltpan  a shallow basin in a desert region; contains salt and gypsum that was deposited by an evaporated salt lake
  subtype:  #tidal_basin__tidalbasin  a basin that is full of water at high tide

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