The Great Barrier Reef Marine Park was established in 1975, and it is the world's largest marine protected area in the world. It is approximately 348,000 square kilometres in area and approximately 2,300 kilometres long, running from just north of Bundaberg to the tip of the Cape York Peninsula. The reef contains over 2,900 reefs which includes 760 fringing reefs, and 300 coral cays. There are also 618 continental islands, which were once part of the mainland. As the world's largest coral reef ecosystem the Great Barrier Reef is home to approximately 1,500 species of fish, 400 species of corals, 4,000 species of molluscs, 500 species of seaweed, 215 species of birds, 16 species of sea snakes, 6 species of sea turtles, and some of the largest populations of dugong in the world.