What is "bohuslan"

Bohuslän is a Swedish province in Götaland, on the northernmost part of the country's west coast. It is bordered by Dalsland to the northeast, Västergötland to the southeast, the Skagerrak arm of the North Sea to the west, and the county of Østfold, in Norway, to the north.

Bohuslän is named after the Norwegian medieval castle of Båhus. Under the name Båhuslen, it was a Norwegian county from around 1050 until the Treaty of Roskilde in 1658, when the kingdom of Denmark-Norway lost this area as well as Skåneland to Sweden.