Clack Island is part of the Great Barrier Reef Marine Park at the tip of Cape Melville, Queensland in Bathurst Bay, Australia.It is north-east of Denham Island and Flinders Island in the Flinders Group National Park.It is around 21 hectares or 0.21 square km in size,Clack Island has a major place in Aboriginal ritual and mythology, and also has a large number of paintings.