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!
https://cdn.britannica.com/64/155864-050-34FBD7A2/view-Great-Barrier-Reef-Australia-coast.jpg
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!
https://oceanservice.noaa.gov/facts/gbrlargeststructure.html