Take a dive through the pages of this spectacular book showcasing our planet's largest World Heritage Area. See it, understand it and join in the challenge to protect it. After all, if we do nothing, looking through the pages of a book may one day be the only way to appreciate this uniquely special underwater wonder. The Great Barrier Reef attracts over two million visitors every year. It is one of the world's greatest natural wonders and one of the planet's most bio diverse habitats. In a country noted for its physical beauty, the Great Barrier Reef is Australia's crown jewel.