#ridge  a long narrow natural elevation or striation
  supertype:  natural_elevation__naturalelevation__elevation  a raised or elevated geological formation
  subtype:  bank.ridge  a long ridge or pile; "a huge bank of earth"
     subtype:  bluff  a high steep bank (usually formed by river erosion)
     subtype:  sandbank  a submerged bank of sand near a shore or in a river; can be exposed at low tide
        subtype:  shoal  a sandbank in a stretch of water that is visible at low tide
  subtype:  bar.ridge  a submerged (or partly submerged) ridge in a river or along a shore
     subtype:  sandbar__sand_bar  a bar of sand
  subtype:  sand_dune__dune  a ridge of sand created by the wind; found in deserts or near lakes and oceans
  subtype:  ledge__shelf  a projecting ridge on a mountain or submerged under water
  subtype:  reef  a submerged ridge of rock or coral near the surface of the water
     subtype:  coral_reef__coralreef  a reef consisting of coral consolidated into limestone
        subtype:  atoll  an island consisting of a circular coral reef surrounding a lagoon
           instance:  Kwajalein  Eniwetok.atoll__eniwetok  Kwajalein.atoll__kwajalein  Midway_Islands
        subtype:  barrier_reef__barrierreef  a long coral reef near and parallel to the shore
        subtype:  Florida_keys__key__cay  a coral reef off the southern coast of Florida
  subtype:  ripple_mark  one of a series of small ridges produced in sand by water currents or by wind

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