#coral_reef__coralreef  a reef consisting of coral consolidated into limestone
  supertype:  reef  a submerged ridge of rock or coral near the surface of the water
  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

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