East Island is one of three islets on Ashmore Reef. It is located at 12º15'S 123º05'E, about midway between Australia and Timor. It is often referred to as East Islet, a name that is used, for example, in The World Factbook; the islet's gazetted name is, however, East Island.
It has an area of around 25,000 square metres. Like the other islands on the reef, it is unpopulated. Politically it is part of Ashmore and Cartier Islands, an external territory of Australia. Some Indonesian groups dispute Australia's claim to these island, however.