The Great Barrier Reef is the world's largest coral reef system, located off the coast of Queensland, Australia. It stretches over 2,300 kilometers and is made up of nearly 3,000 individual reefs and islands. This UNESCO World Heritage site is home to a diverse range of marine life, including fish, corals, and sea turtles. The reef plays a crucial role in the ecosystem, providing habitat and food for many species. It also supports local economies through tourism and fishing. However, the Great Barrier Reef faces threats from climate change, pollution, and overfishing, which impact its health and biodiversity.