Gotlan (help·info) is a county, province and municipality of Sweden and the largest island in the Baltic Sea. At 3,140 square kilometers in area, it makes up less than one percent of Sweden's total land area. The region also includes the small islands of Fårö and Gotska Sandön to the north, and the tiny Karlsö Islands to the west. The inhabitants number is 57,317 (2006 SCB figure), with about 22,600 living in the primary city Visby. The main sources of income to the island are tourism and agriculture and concrete production from locally mined limestone.