Øvrebøtjern, Gea Norvegica Unesco Global Geopark

About

Øvrebøtjern in Siljan is much more than a popular swimming spot (badevann) in Telemark—it is a living historical archive. Discover an area where fascinating stories stretch from Earth's ancient history to the rich logging and timber floating history (tømmerfløting) of modern times. Perfect for those seeking nature experiences in Siljan, swimming, or geological insight.

What Makes Øvrebøtjern Unique?

• Popular Swimming Destination: A sought-after lake for swimming in Siljan for the whole family throughout the summer season.
• Geological Time Capsule: Experience rocks formed approximately 300 million years ago during the Permian period. Ramsås, which plunges into the lake's eastern side, is an impressive example of Syenite from this time, formed during the breakup of the supercontinent Pangea.
• Traces of the Ice Age: The area is rich with evidence of the last Ice Age, including glacial striations (skuringsstriper) and erratic boulders (flyttblokker). The entire Siljan valley (Siljansdalføret), including Øvrebøtjern, constituted a fjord during the Ice Age, which contributed to the fertile soil in the valley.

From Timber Floating to Summer Idyll

Although Øvrebøtjern is best known today as a beloved swimming area, the lake has a rich cultural-historical background. Previously, the Siljan waterway (Siljansvassdraget) was a crucial timber floating artery—an "expressway for timber."

At the beginning of the 20th century, Siljan was home to one of Norway's strongest lumberjack communities (skogsarbeidermiljøer). The timber was transported down the waterway towards Larvik. Explore the area where you can see historical traces of this significant era in Norwegian forestry history.