Great Barrier ReefAUSTRALIA

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Great Barrier Reef is the largest coral reef system in the world and the world's biggest single structure made by living organisms. The reef is located in the Coral Sea, off the coast of Queensland, Australia. It stretched for over 2,300 kilometers (1,400 mi) over an area of about 344,400 square kilometers (133,000 sq mi). It can be seen from outer space. Great Barrier Reef is included in UNESCO World Heritage List