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)
Mora–Siljan Airport The number of passengers fell dramatically from about 50,000 passengers per year in the 1980s to 7,000 in recent years, following a trend experienced during this period by all Swedish third-level airports. Cutthroat competition between two domestic airlines, Skyways Express and the defunct European Executive Express, came to an end in 2005, leaving the area without flights to Stockholm and the outside world, requiring a 4-hour drive or train travel. Mora Municipality managed the airport before Dalaflyget was established. From 2016 until 2018 AIS Airlines operated the line to Stockholm. On 28 February 2018, the route to Stockholm Arlanda was