The world's largest reef system is the Great Barrier Reef, located off the northeast coast of Australia. Spanning over 344,000 square kilometers, it is home to a diverse array of marine life, including thousands of species of fish, coral, and other aquatic organisms. The Great Barrier Reef is not only a UNESCO World Heritage site but also plays a crucial role in marine research and tourism, attracting millions of visitors each year. However, it faces significant threats from climate change, pollution, and coral bleaching, making its preservation essential for both ecological and economic reasons.