The largest coral reef system in the world is the Great Barrier Reef, located off the coast of Queensland, Australia. Spanning over 344,000 square kilometers, it is home to thousands of marine species, including various fish, coral types, and other aquatic life forms. The Great Barrier Reef is a UNESCO World Heritage Site, recognized for its biodiversity, cultural significance, and ecological importance. However, it faces significant threats from climate change, coral bleaching, pollution, and overfishing. Efforts are ongoing to protect and preserve this natural wonder for future generations.