Green Island is a very popular coral cay 27 km (17 mi) offshore from Cairns, Queensland, Australia located within the Great Barrier Reef Marine Park World Heritage Area. 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 diverse vegetation, including dry coastal/beach plants and a vine thicket rain forest. There are no natural freshwater springs on the island - all vegetation relies on rainwater and a small freshwater lens located under the island. The local Aboriginal people (particularly Dick Moses, speaking Yidinyji) have reported that some time back in the past (in time immemorial) Dabuukji (Green Island) was approximately four times the size it is now. The present coral cay is only the north-east portion of the whole, original island. (source)
Thank you for this wonderful surprise Heather!
Heather has a postcard blog too, go and have a look! :)