The Great Barrier Reef is the only living organic collective visible from Earth's orbit. The Great Barrier Reef, off the east coast of Australia, is one of the wonders of the natural world - it is the world's largest coral reef ecosystem.
The Aussies are justifiably proud of the largest coral reef on earth – the Great Barrier Reef. It can be seen from space and is believed to be the world’s biggest single structure made from living organisms. Composed of some individual reefs and 900