Short answers, pulled from the story.
Bohuslän translates as the Fief of Bohus, referring to the medieval Norwegian castle of Bohus on the Göta River. The province took its name from this fortress, which served as one of the key strongholds of the Norwegian kingdom.
Bohuslän was ceded to Sweden by the Treaty of Roskilde in 1658. Before that, it had been Norwegian territory from at least the 11th century and later part of the Denmark-Norway union from 1537.
The rock art at Tanum in Bohuslän dates to the Nordic Bronze Age, with some carvings estimated at 2,500 to 3,000 years old. The site has been entered into the UNESCO World Heritage program and depicts human figures, ships, animals, and fertility symbols.
Gullmarsfjorden, also called Gullmarn, is Sweden's only threshold fjord, located near Lysekil in Bohuslän. It is 25 kilometres long, between 1 and 3 kilometres wide, and reaches a maximum depth of 118.5 metres, creating conditions for unique marine life.
Bohuslän was heavily forested before the expansion of commercial herring fishing in the 18th century. Deforestation during the 19th century stripped the province of much of its tree cover, as wood was consumed for building boats, houses, and fuelling herring oil boilers called trankokerier.
For a period, Marstrand operated as a porto Franco, a free port with free religious practice. This status made it home to the only synagogue in Sweden at the time. Marstrand received its town charter around 1200 and also housed the fortress of Carlsten, built in the 17th century.