St Helena Island is a heritage-listed island in Queensland, Australia, 21 kilometres (13 mi) east of Brisbane and 4 kilometres (2.5 mi) east of the mouth of the Brisbane River in Moreton Bay. Originally used as a prison, it is now a national park. Local Australian Aborigines called the island Noogoon but it was renamed St Helena after an aboriginal named Napoleon was exiled there in 1826. The island is visible from the mainland, particularly the suburbs of Wynnum, Manly and Lota. It has its own permanent water supply, a spring in the centre of the island.