The region of the world known for the Great Barrier Reef is Australia. Located off the Queensland coast, this UNESCO World Heritage site is the largest coral reef system globally, stretching over 2,300 kilometers. It is home to an incredibly diverse range of marine life, making it a significant area for ecological studies and tourism. The Great Barrier Reef attracts millions of visitors annually, offering activities such as snorkeling, diving, and boat tours, highlighting its importance for both conservation and the tourism industry.