The river Lågen have dug it's way up through thick marine sediments from the time Lågendalen was a icy sea fjord after the last ice age. There are a lot of ravines along the river bank.
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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