Green Island (originally Dabuukji) is a coral cay 27 km offshore from Cairns and located within the Great Barrier Reef Marine Park World Heritage Area. The island is surrounded by coral reef and protected in the Green Island National Park.
The island was formed approximately 6,000 years ago by waves depositing sand, coral and other debris onto its coral foundations.
Today the island supports a range of vegetation, including dry coastal/beach plants and a vine thicket rain forest. There are no natural freshwater springs on the island so all vegetation relies on rainwater and a small freshwater lens located under the island.