Which is the largest coral reef system in the world, a World Heritage Site?

The Great Barrier Reef is the world’s largest coral reef system and a World Heritage Site off Australia’s Queensland coast.

Stretching for more than 2,300 kilometers through the Coral Sea, the reef is made up of thousands of individual reefs and hundreds of islands. It is not a single solid wall of coral but a vast, interconnected ecosystem built over time by billions of tiny coral polyps. Its size and biological richness make it one of Earth’s most important marine environments.

The reef supports an extraordinary range of life, including hard and soft corals, sea turtles, reef fish, sharks, rays, seabirds, dolphins, and dugongs. The Great Barrier Reef Marine Park, established in 1975, regulates activities such as fishing, tourism, shipping, and research across much of the area.

Australia’s Great Barrier Reef was inscribed on the UNESCO World Heritage List in 1981 for its outstanding natural beauty, ecological processes, biodiversity, and geological importance. A common mix-up is confusing the reef with the Great Barrier Reef Marine Park: the park is the protected management area, while the reef is the natural coral ecosystem within and beyond it.