The ocean where the Great Barrier Reef is found is the Coral Sea, which is part of the Pacific Ocean. The Great Barrier Reef is the largest coral reef system in the world, stretching over 2,300 kilometers along the northeast coast of Australia. It is renowned for its stunning marine biodiversity, housing thousands of species of fish, corals, and other marine life. The reef is a UNESCO World Heritage Site and attracts millions of tourists each year for activities such as diving, snorkeling, and marine research.