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The largest living structure on Earth is the Great Barrier Reef, which is located off the coast of Australia. It's a sprawling coral reef system that spans over 2,300 kilometers (1,400 miles) and is home to more than 1,500 species of fish, 411 species of hard corals, and a vast array of other marine life. The Great Barrier Reef is so vast that it can even be seen from space!