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Nature attractions in Porsgrunn
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Forested ridges and bare rock surfaces at Siljan
Siljan is dominated by forested areas with knobby hills around a central valley, the Siljan valley....
Faults and zones of weakness
South of Porsgrunn, across Frierfjorden and further into Bamble by Herre, there is an extensive fault, the results of a...
From landscape to landscape
Bamble is dominated by two types of landscape with completely different geological histories. In the west the landscape...
1500 million of years of geological history
Skien is a community with an exceptional geological diversity. A tour across the Skien-Gjerpendalen...
It's owned by the counties of Telemark and Vestfold, together with the eight municipalities of Bamble, Kragerø, Nome, Porsgrunn, Siljan, Skien,...
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