Sommen () is a lake in the South Swedish highlands lying across the border of the provinces of Östergötland and Småland. Situated about 147 metres above mean sea level, the lake has an area of and has a maximum depth of 60 metres. The lake is shared between the administrative kommunes of Ydre, Kinda, Boxholm and Tranås 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. In and around the lake various rare species are protected in a series of nature reserves, bird sanctuaries and areas closed for fishing. Måltorpet Granbo in Sommen is a Natura 2000 area. The visitor centre and natural history museum, Naturum Sommen, lies at the northern end of Torpön island, near the central part of the lake. According to the Svensk ortnamnslexikon the lake name was given as Sooma in 1447 and is derived from the local dialect word somma meaning an oversized vessel. This may be in relation to the lake's size or the cliffs along its shores. Scholar Robert Norrby considered that the name Sommen originated as a noa-name - an unknown sacred or taboo name that the lake had. History Origin myth Local mythology asserts that the lake was created by a cow called Urkon or Sommakoa. The lake basin was carved by Urkon with her hooves during an outburst of wrath; subsequently the basin was filled with water which became the lake. Following this, the wizard Somme from Tullerum locked Urkon in a cave, Urkons Grotta. It was said that she would escape when a crowned king visited the district of Ydre, where the lake lies, and kill him. According to folklore this was the fate of the legendary king Frode. As Frode was passing through Ydre, Urkon escaped and chased him; when he thought he had left Ydre and was thus safe, the cow killed him. At present there are two commemorative raised stones at Fruhammar, the location of this purported event. In Urkons Grotta, the cow is said to rest on a bed of mineral coal and fur. Each Christmas Urkon eats one hair straw from the fur, and when