The Great Barrier Reef is the largest living organism and ecosystem on earth and is visible from space. Learn about this natural wonder of the world with our guide to the coral, marine life, reef facts and threats that the Great Barrier Reef is currently facing. Learn.. Earth from Space: Great Barrier Reef. This Envisat image features one of the natural wonders of the world - the Great Barrier Reef in the Coral Sea off the east coast of Queensland, Australia. Extending more than 2000 km and covering an area of some 350 000 sq km, it is the largest living organism on Earth and the only living thing the naked.

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The Great Barrier Reef is a site of remarkable variety and beauty on the north-east coast of Australia. It contains the world's largest collection of coral reefs, with 400 types of coral, 1,500 species of fish and 4,000 types of mollusc. It also holds great scientific interest as the habitat of species such as the dugong ('sea cow') and.. The Great Barrier Reef: Australia's National Treasure. Located in the Coral Sea off Queensland, the Great Barrier Reef encompasses more than 2,900 individual reefs and 900 islands. It is more than 1,400 miles (2,300 kilometers) long and covers an area of about 133,000 square miles (344,400 square kilometers).