great barrier reef

Noun
  1. The largest coral reef in the world;
    In the Coral Sea off the northeastern coast of Australia (synset 109315254)
    is an instance of: coral reef - a reef consisting of coral consolidated into limestone
    is a part of:
    • australia, commonwealth of australia - a nation occupying the whole of the Australian continent; Aboriginal tribes are thought to have migrated from southeastern Asia 20,000 years ago; first Europeans were British convicts sent there as a penal colony
    • australia - the smallest continent; between the South Pacific and the Indian Ocean

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