The world's largest coral reef system is the Great Barrier Reef, located off the coast of Queensland, Australia. Spanning over 2,300 kilometers (approximately 1,430 miles), it comprises around 2,900 individual reefs and 900 islands. This UNESCO World Heritage site supports a diverse ecosystem, including thousands of species of marine life, such as corals, fish, sea turtles, and marine mammals. The reef serves as a critical habitat, providing ecological services, supporting tourism, and contributing to scientific research. However, it faces significant threats from climate change, pollution, and overfishing, prompting conservation efforts to protect this vital marine ecosystem.