Along the tropical coast of Australia the greatest creation of nature stretches for more than 2900 km. It`s the Great Barrier Reef. The world's largest coral reef system is the largest structure made by living organisms on the planet. It includes almost 3,000 different reefs and more than 900 islands. The area covered by the stone sea giant is 344,400 square kilometers. It supports a wide diversity of life and was selected as a World Heritage Site in 1981.