Sommen (Swedish pronunciation: [ËsÊÌmËÉn]) is a lake in the South Swedish highlands lying across the border of the provinces of Ăstergötland and SmĂ„land. Situated about 147 metres above mean sea level, the lake has an area of 132 km (51 sq mi) and has a maximum depth of 60 metres. The lake is shared between the administrative kommunes of Ydre, Kinda, Boxholm and TranĂ„s and the area around it is sparsely populated.
The lake has very clear water, with a visibility of 8 to 10 metres deep, if conditions are good. This makes Sommen one of the greatest clear-water lakes in Sweden. According to tradition Sommen has 365 islands, one for each day of the year. The actual number is around 260.