The reef is located in the Coral Sea, off the coast of Queensland, Australia, separated from the coast by a channel 160 kilometres (100 mi) wide in places and over 61 metres (200 ft) deep. The Great Barrier Reef can be seen from outer space and is the worlds biggest single structure made by living organisms. This reef structure is composed of and built by billions of organisms, known as coral polyps. It supports a wide diversity of life and was selected as a World Heritage Site in 1981. CNN labelled it one of the Seven Natural Wonders of the World in 1997.Australian World Heritage places included it in its list in 2007. The Queensland National Trust named it a state icon of Queensland in 2006.





















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