Question

It is the world's largest reef system.Composed of over 2,900
individual reef, it is a popular tourist destination with over two
million visitors each year. It can be seen from outer space.​

Answer 1

Answer:

The Great Barrier Reef

The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland, Australia.

Explanation:

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