Great Barrier Reef

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Satellite view, courtesy NASA.

great_barrier_reef_satellite.jpg The Great Barrier Reef, in Australia's Coral Sea, is the largest structure on earth built by living organisms.

It is the largest complex of coral reefs and islands in the world, with some 2,900 distinct reefs, 900 islands, and a total length along the Queensland coast of 2,600 kilometres (1,600 mi).

It covers an area of approximately 344,400 square kilometres (133,000 sq mi).

Organism groups in native range Great Barrier Reef: