The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms. This reef structure is composed of and built by billions of tiny organisms, known as coral polyps. It supports a wide diversity of life and was selected as a World Heritage Site in 1981.CNN labeled it one of the seven natural wonders of the world.The reef is located in the Coral Sea, off the coast of Queensland, Australia.
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