The Great Barrier Reef is the world's largest coral reef located off the coast of Queensland, Australia. It generates over $3 billion per year from tourism, especially to the Whitsunday Islands and Cairns. The reef is home to many species like turtles, clownfish, jellyfish, sharks, coral, and more. Clownfish have a symbiotic relationship with sea anemones, hiding from predators in their tentacles while keeping the anemones clean.