Tiga Island is formed through the eruption of mud volcano in 1897. The island is now part of the Tiga Island National Park together with Kalampunian Besar and Kalampunian Damit islands as a tourist attractions, with a mud bath tourism. The Tunku Abdul Rahman National Park is a group of five islands of Gaya, Manukan, Mamutik, Sapi and Sulug. These islands are believed to once connected to the Crocker Range but separated when sea levels rose since the last ice age. The Tun Mustapha Marine Park is the largest marine park located in the north of Sabah. It covers the three major islands of Banggi, Balambangan and Malawali. Another marine park is the Tun Sakaran Marine Park located in the south-east of Sabah. The park comprising the islands of Bodgaya, Boheydulang, Sabangkat and Salakan along with sand cays of Maiga, Mantabuan and Sibuan. Bodgaya is gazetted as a forest reserve, while Boheydulang as a bird sanctuary. These islands are formed by Quaternary pyroclastic material that was ejected during explosive volcanic activities.