Gotland (/ˈɡɒtlənd/, Swedish pronunciation: [ˈɡɔtland] ( listen) or [ˈɡɔlland]), sometimes Gottland (/ˈɡɒtlənd/) or Gothland (/ˈɡɒθlənd/), Gutland in the local language Gutnish, is a province, county, municipality, and diocese of Sweden. It is Sweden's largest island and the largest island in the Baltic Sea. With its total area of 3,140 square kilometers, the island of Gotland and the other areas of the province of Gotland make up less than one percent of Sweden's total land area. The province includes the small islands of Fårö and Gotska Sandön to the north and some tiny islands, including the Karlsö Islands (Lilla and Stora) to the west. The island of Gotland has an area of 2,994 km², whereas the province has 3,183.7 km² (3,151 km² of land excluding the lakes and rivers). The population is 57,221, of which about 22,200 live in Visby, the main town. The island's main sources of income are tourism, agriculture, and concrete production from locally mined limestone.