The largest reef system in the world is the Great Barrier Reef, located off the northeastern coast of Australia. Stretching over 2,300 kilometers, it consists of approximately 2,900 individual reefs and 900 islands. The Great Barrier Reef is a UNESCO World Heritage site and is renowned for its stunning biodiversity, hosting thousands of marine species, including fish, corals, and sea turtles. It plays a significant ecological role and is a vital habitat for many marine creatures. The reef also supports tourism and fishing industries, drawing millions of visitors annually.