great barrier reef: world's largest coral reef system
The Great Barrier Reef is possible the grandest natural wonder in the world and is the only wonder of nature that may be visible recognized from outer space. The reef stretches 1,600 miles (2,600 km) along the north eastern coast of Australia and it covers over 133,000 square miles (344,000 sq km).
The Great Barrier Reef can be seen from the air in scenic flights, underwater with scuba diving excursions, or from atop the water from one of the abundant opportunities to snorkel.
The reef is protected by the Great Barrier Reef Marine Park with numerous public access points through island stays on the reef to boating excursions from the mainland.