Final answer:
The Earth's largest coral reef is the Great Barrier Reef located in the Coral Sea, off the coast of Queensland, Australia.
Step-by-step explanation:
The Earth's largest coral reef is the Great Barrier Reef. It is located in the Coral Sea, off the coast of Queensland, Australia. The Great Barrier Reef is renowned for its biodiversity and stretches over 2,300 kilometers.
Learn more about Great Barrier Reef