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 Siljan, Norway Siljan is a municipality in Telemark county, Norway. It is part of the traditional region of Grenland. The administrative centre of the municipality is the village of Siljan. The parish of "Slemdal" was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The name was later changed to Siljan. The municipality is located northeast of Skien and borders Buskerud county in the north and Vestfold county in the east. There is a forest district on both sides of Skiensvassdraget (Skien river). The older main road to Skien, Larvik, and Oslo, passes through Siljan. The municipality (originally the