One of Australia’s most remarkable natural sights is the world heritage-listed Great Barrier Reef, the largest coral reef in the world. Beneath the water is a kaleidoscope of colours with more than 400 types of coral and 1,500 species of fish. Above the surface are coral cays and picturesque tropical islands with some of the world’s most beautiful sun-soaked golden beaches. The reef stretches over 2,300km, from the Torres Strait in Tropical North Queensland down to Bundaberg in the south, but is most easily accessible from Port Douglas and Cairns. There are more than 900 islands, ranging from small, uninhabited islets and cays to exclusive private island retreats.