In the center of Siljan amidst a very characteristic syenite landscape lies the Øverbøtjern tarn.
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Gea Norvegica Geopark is the first European Geopark in Scandinavia. It is located in southeastern Norway, in the counties of Vestfold and Telemark.
The Geopark is limited by the administrative areas of the muncipalities Kragerø, Bamble, Porsgrunn, Skien, Siljan, Nome, Lardal and Larvik