3.Ran Great Barrier Reef
Great Barrier Reef's coral reef system of the world's largest, covering about 30 thousand individual reefs and 900 islands stretching about 2,600 kilometers in waters off Queenlands. Coral reefs can be seen from outer space and also was recognized as a World Natural Heritage in 1981. Coral reefs are formed about 25 million years ago. This is a very attractive place travelers
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