The largest living structure on Earth is the Great Barrier Reef. Located off the coast of Queensland, Australia, it spans over 2,300 kilometers and comprises thousands of individual reefs and islands. The reef is not just significant for its size, but also for its biodiversity, housing thousands of marine species, including fish, corals, and mollusks. It is a vital ecosystem that supports both marine life and human activities such as tourism and fishing. Unfortunately, the Great Barrier Reef is facing threats from climate change, pollution, and coral bleaching, which pose challenges to its preservation.