The Great Barrier Reef is the largest coral reef system in the world.
It is found in the Coral Sea, off the coast of Queensland, Australia.
The Great Barrier Reef is the world’s largest living structure.
It is made up of around 2900 individual reefs and 900 islands.
The Great Barrier Reef is around 2600 kilometres (1616 miles) in length.
Astronauts can see the Great Barrier Reef from space.
Marine animals called coral play an important role in the formation of the Great Barrier Reef.
Coral create calcium carbonate which forms a hard, shell-like skeleton.
The Great Barrier Reef is home to a wide range of life, including fish, sea turtles, giant clam, seahorse, sea snakes, nudibranch, sea turtles, stingray, sharks and many more.
Over 1500 different species of fish live in the Great Barrier Reef, including clownfish, star of the animated film Finding Nemo.
Whales, dolphins and dugong can also be seen in the Great Barrier Reef.
Climate change is perhaps the biggest threat to the Great Barrier Reef.
Warmer ocean temperatures put stress on coral and lead to coral bleaching.
The Great Barrier Reef is a popular tourist destination with around 2 million visitors every year.