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 over an area of approximately 344,400 square kilometres. The reef is located in the Coral Sea, off the coast of Queensland, Australia, separated from the coast by a channel 160 kilometres wide in places and over 61 metres deep. The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms.

Source: Wikipedia