Great Barrier Reef 5.15

Australia’s Great Barrier Reef is the world’s largest coral reef, covering over 350,000 square kilometres of the sea off the Tropical North Queensland Coast of Australia in the Coral Sea.
The Great Barrier Reef, the largest coral formation in the world, extends northward nearly to Papua New Guinea, from its southernmost outpost at Lady Elliott Island a distance of 2300 kilometres It is not a single continuous reef but a vast assemblage of reefs, shoals and islands.
The Great Barrier Reef is a World Heritage listed site and is listed as one of the seven Natural Wonders of the world.
Believed to be the densest assemblage of living organisms to be found in any comparable area in the world.
On average the Great Barrier Reef is about 40 metres deep.