coral reef

Noun
  1. is a type of: reef - a submerged ridge of rock or coral near the surface of the water
    subtypes:
    • atoll - an island consisting of a circular coral reef surrounding a lagoon
    • barrier reef - a long coral reef near and parallel to the shore
    • cay, florida key, key - a coral reef off the southern coast of Florida
    specific instances: great barrier reef - the largest coral reef in the world; in the Coral Sea off the northeastern coast of Australia

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