Lombok is an island in West Nusa Tenggara province, Indonesia. It is part of the chain of the Lesser Sunda Islands, with the Lombok Strait separating it from Bali to the west and the Alas Strait between it and Sumbawa to the east. It is roughly circular, with a "tail" to the southwest, about 70 km across and a total area of about 4,725 km² (1,825 sq mi). The administrative capital and largest city on the island is Mataram
The Lombok Strait marks the passage of the biogeographical division between the fauna of the Indomalayan ecozone and the distinctly different fauna of Australasia that is known as the Wallace Line, for Alfred Russel Wallace, who first remarked upon the distinction between these two major biomes.The island's topography is dominated by the centrally-located stratovolcano Mount Rinjani, which rises to 3,726 m (12,224 ft), making it the third-highest in Indonesia. The most recent eruption of Rinjani was in June-July, 1994. The volcano, and its sacred crater lake, Lake Segara Anak, are protected by a National Park established in 1997. The southern part of the island is a fertile plain where corn, rice, coffee, tobacco, and cotton are grown.The island's inhabitants are 85% Sasak (a people, closely related to the Balinese, but mostly practising Islam), 10-15% Balinese, with the small remainder being Chinese, Arab, Javanese, and Sumbawanese.