The geographical feature known as the Great Barrier Reef is a massive coral reef system located off the coast of Australia. It is the largest coral reef in the world and can be seen from outer space, stretching over 2,300 kilometers. The reef supports a rich biodiversity, including thousands of species of marine life, making it a UNESCO World Heritage Site. It is a prime destination for diving, snorkeling, and tourism, and its ecological health is vital for the environment. The Great Barrier Reef faces threats from climate change and human activity, prompting conservation efforts.