The largest living structure on Earth is the Great Barrier Reef, located off the coast of Queensland, Australia. Stretching over 2,300 kilometers (1,430 miles), this coral reef system is composed of thousands of individual reefs and is home to a diverse array of marine life. It is visible from space and serves as a habitat for numerous species, including fish, mollusks, and sea turtles. The Great Barrier Reef is not only a natural wonder but also a significant ecological environment and a popular destination for tourism.