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Great Barrier Reef
The Great Barrier Reef is the world's largest reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,600 kilometres (1,600 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland in north-east Australia. The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms.
This description uses material from the Wikipedia article on Great Barrier Reef and is licensed under the Creative Commons Attribution-ShareAlike License (view authors).