 The main islands of this group are Middle Island, Square Island, Long Island, Pelsaert Island, Basile Island and the Mangrove Group.A great many ships have been wrecked in the Pelsaert Group, most notably "Zeewijk", which was wrecked on the Half Moon Reef in 1727, the survivors staying on Gun Island for some time afterwards.Other wrecks include "Ocean Queen", wrecked on the Half Moon Reef in 1842; "Ben Ledi", wrecked off Pelsaert Island in 1879; and "Windsor", wrecked on the Half Moon Reef in 1908.