Storsjön (Swedish pronunciation: [ˈstûːrɧøːn], lit. 'The Great Lake') is the fifth largest lake in Sweden, with an area of 464 km2 (179 sq mi) and a greatest depth of 74 m (243 ft). It is the largest lake in central Sweden, located in the province of Jämtland in modern Jämtland County. From Storsjön runs the river Indalsälven and the lake contains the major island Frösön. The city of Östersund is located on the east shore of the lake, opposite Frösön.
https://en.wikipedia.org/wiki/Storsj%C3%B6n