The Great Barrier Reef is located off the coast of Australia. This UNESCO World Heritage site is the world's largest coral reef system, stretching over 2,300 kilometers and composed of nearly 3,000 individual reefs and islands. It is renowned for its stunning marine biodiversity, housing thousands of species of fish, coral, and other marine organisms. The reef is a vital ecosystem that supports various wildlife and contributes significantly to the local economy through tourism and fishing. However, it faces threats from climate change, pollution, and overfishing, prompting conservation efforts to protect this natural wonder.