The world's largest coral reef system of over 2,900 individual reefs and 900 islands covers an area of approximately 344,400 square kilometres. The biggest single structure made by living organisms is composed of, and built by, billions of tiny coral polyps and is easily discernable from space.
- Where: Queensland / East Coast
- Ideal for viewing: dugong, green turtle, saltwater crocodile, white-bellied sea eagle, roseate tern
- Excellent for: Wildlife cruises