Australia's Great Barrier Reef is one of the world's seven natural wonders, it is a prized World Heritage Area, the largest reef system and the biggest living structure on the planet. It sprawls over a jaw-dropping 344,400 square kilometres – an area so large that it can be seen from space.

The Reef is composed of 3,000 individual reef systems, 600 tropical islands and about 300 coral cays. This complex maze of habitats provides refuge for an astounding variety of marine plants and animals – from ancient sea turtles, reef fish and 134 species of sharks and rays, to 400 different hard and soft corals and a plethora of seaweeds.