Island, south-central Indonesia. It is one of the Lesser Sunda Islands, separated from Bali (west) by the Lombok Strait and from Sumbawa (east) by the Alas Strait. It occupies an area of 2,098 sq mi (5,435 sq km). Lombok is divided by two mountain chains; its higher northern range rises to 12,224 ft (3,726 m) at Mount Rinjani. It was ruled by the sultan of Makasar in 1640. The Balinese later seized control and established four kingdoms there; the Dutch ruled the kingdom of Mataram from 1843 and gained control of the entire island by the late 19th century. Following World War II, it became part of Indonesia.