The Great Barrier Reef is located off the coast of Australia. It is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching around 2,300 kilometers. As a UNESCO World Heritage site, it hosts a diverse array of marine life, including various species of fish, corals, and sea turtles. The reef plays a crucial role in Australia’s ecology and economy, attracting millions of tourists each year who come to enjoy its stunning underwater landscapes and unique biodiversity.