Everything you ever needed to know about Australia’s greatest natural wonder, but were too overcome by its sheer size and scope to ask. By Fiona Harper Welcome to the Ultimate Guide to the Great Barrier Reef Marine Park, an extraordinary ecosystem comprising more than 3000 individual reefs, as well as 900 coral cays and continental islands. Some, like Morris Island in the far north, are little more than a strip of finely crushed coral sand, grimly bound together by the roots of a solitary palm tree. Others, like vast Hinchinbrook Island, a lofty 1100m above the mangroves, could easily...