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Great Barrier Reef
The Great Barrier Reef is the world's largest coral reef system, stretching over 2,300 kilometres along the Queensland coast of Australia. Located offshore from Cairns, it comprises nearly 3,000 individual reefs and 900 islands. Inscribed as a UNESCO World Heritage Site in 1981, it is renowned for its exceptional biodiversity, coral formations, and marine life, and is accessed primarily by boat tours from Cairns.