Suppose The Great Barrier Reef is the largest coral reef system in the world, stretching over 2,300 kilometers off the coast of Queensland, Australia. It is home to a diverse range of marine life, including colorful coral, fish, turtles, and sharks. The reef is a popular destination for tourists and divers from around the world.
Can we infer that "The Great Barrier Reef is a man-made structure."? Yes, no, or maybe?