Siljan (lake) Siljan (lake) Siljan, in Dalarna in central Sweden, is Sweden's sixth largest lake. The cumulative area of Siljan and the adjacent, smaller lakes Orsasjön and Insjön is . Siljan reaches a maximum depth of , and its surface is situated above sea level. The largest town on its shore is Mora. The lake is located around the southwestern perimeter of the Siljan Ring (Swedish: "Siljansringen"), a circular geological formation which was formed 377 million years ago in the Devonian by a major meteorite impact. The original crater, now mostly eroded, is estimated to have been about 52 km (32 mi)
Siljan, Norway parish) is named after the old "Siljan" farm (Old Norse: "Seljur"), since the first church was built there. The name is (probably) the plural form of "selja" which means "sallow tree" or "willow". Prior to 1918, the name of the municipality was "Slemdal". The coat-of-arms is from modern times. They were granted in 1989. The arms show three white saw blades on a green background. It was chosen to represent the timber industry of the municipality. Siljan, Norway Siljan is a municipality in Telemark county, Norway. It is part of the traditional region of Grenland. The administrative centre of the