#bank.ridge  a long ridge or pile; "a huge bank of earth"
  supertype:  #ridge  a long narrow natural elevation or striation
  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

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