Siljan is a municipality in the county of Telemark, Norway.
The parish of Slemdal was established as a municipality January 1, 1838 (see formannskapsdistrikt).
The municipality is located northeast of Skien and borders in the north to Buskerud county and in the east to Vestfold county. 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 parish) is named after the old farm Siljan (Norse *Seljur), since the first church was built there. The name is (probably) the plural form of selja f 'sallow-tree, willow'.
Until 1918 the name of the municipality was Slemdal.
The coat-of-arms is from modern times (1989). It shows three blades of saw. (To represent the timber industry of the municipality.)
Source: CIA Factbook, Wikipedia
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