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The Great Barrier Reef, located off the coast of Queensland, Australia, is the world's largest coral reef system. It is composed over 2,900 reefs 900 islands stretching for 2,300 kilometers. massive is by of tiny organisms as coral . It supports an extraordinary diversity of life, including numerous species of fish, mollusks, birds, and marine mammals. Recognized as a UNESCO World Heritage Site, it is one of the most complex and biologically rich ecosystems on the planet.