Short answers, pulled from the story.
The coastline of Bohuslän stretches along the Skagerrak arm of the North Sea and features about 3,000 islands and 5,000 islets known as skerries. These landforms make up the northern part of the Gothenburg archipelago which ranks as Sweden's second largest archipelago after Stockholm.
Bohuslän belonged to Denmark-Norway until it was ceded to Sweden in 1658 following the Treaty of Roskilde. The transfer occurred during the reign of Charles X Gustav who died in 1660 shortly after the county changed hands.
Commercial herring fishing increased significantly during the 18th century and the province flourished during a major herring period spanning from 1747 to 1809. This era saw many small fishing communities grow up around the coastlines while forests disappeared rapidly to support the booming industry infrastructure.
Rock carvings at Tanum date back approximately 2,500 to 3,000 years ago and depict scenes from daily life and religious rituals. UNESCO entered the site into its World heritage program due to cultural significance and these images portray an agricultural society with human figures and animals.
Gothenburg and Bohus County merged in 1998 to form Västra Götaland County which reduced administration costs across the larger territory. Provinces of Sweden serve no administrative function in the modern era as counties handle all administrative duties instead for regions like Bohuslän.