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The county surrounding Oslo, from the shores of the Oslofjord to the forests and lakes inland.
Information checked on 10 October 2026.
A small white wooden town on the Oslofjord, facing Oscarsborg Fortress, built on an islet between 1845 and 1855. On 9 April 1940 its guns and torpedoes sank the German cruiser Blücher, delaying the occupation of Oslo. The fortress is now a museum, with a guest harbour, restaurant and hotel.
A manor built from 1796 at Eidsvoll Verk, where the National Assembly drafted Norway's Constitution in spring 1814, signed on 17 May — now the national day. Restored and reopened in 2014 for the bicentenary, it can be visited as a national monument.
A modern and contemporary art centre opened in 1968 by the figure skater Sonja Henie and the shipowner Niels Onstad, at Høvikodden (Bærum), by the fjord. Around 8,000 works, including Matisse, Picasso and Munch, and a park of some thirty sculptures.
Where the Glomma flows into Lake Øyeren, Northern Europe's largest inland delta, this 2.5 km floating boom sorted the logs floated down the river from 1861 to 1985. The only complete facility of its kind left in the world, it is now a museum and nature information centre.