The world's largest coral reef is the Great Barrier Reef, located off the coast of Queensland, Australia. Spanning over 2,300 kilometers (1,430 miles), it encompasses approximately 344,400 square kilometers (133,000 square miles) and consists of thousands of individual reefs and islands. This UNESCO World Heritage site is renowned for its incredible biodiversity, supporting thousands of species including fish, corals, sharks, and turtles. The Great Barrier Reef is vital for marine research, tourism, and local fishing industries. However, it faces significant threats from climate change, pollution, and coral bleaching, prompting concerted global conservation efforts to protect this natural wonder.