The Great Barrier Reef in Australia is the largest living structure on Earth. It is the only living thing on Earth which is visible from space. It spans around 2,300 km and composed of coral islands and reefs.
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The Great Barrier Reef in Australia is the largest living structure on Earth. It is the only living thing on Earth which is visible from space. It spans around 2,300 km and composed of coral islands and reefs.
