Bohaska the Church is located along the old Norwegian-Swedish border, North East from Hisingen where the göta river splits into two branches (20 kilometres North of Gothenburg). The fortress rises 40 meters above sea level, and the river forms a natural moat around it.

Construction Boguski of the fortress began in 1308 under king Hakon V Magnus, king of Norway, in the period from 1299 until 1319 years. Hakon V also initiated the construction of fortresses Akershus and Wardobes as part of a broad defense policy. At that time the land on which is located Bohaska fortress was part of Norway, and it served as the main point of reference the Norwegian defence against Sweden along the coast.

Written documents 1310, indicate that the fortress was built of granite and brick, which was typical for the era, perhaps under the leadership of count Jacob of Halland. By 1450 it included a continuous surrounding wall thickness of 3 meters at the base and the height ranged from 8, 5 to 13, 5 meters, depending on terrain. It was a rectangular structure with four corner towers. In the Eastern part was the brick tower, and in the center West side - gate and drawbridge. Along the inner side of the surrounding walls were located various buildings, including the Royal hall, chapel, guard house, barracks and kitchen. At the time Bohaska the fortress was the most powerful fortress in the region. Throughout its history the fortress was often subjected to sieges, however, never was captured.

At the end of the 18th century it was decided that the fortress must be destroyed because it is no longer used. Analysis of structures lasted for 2 months until it ran out of the allocated money. Residents of the nearby town of Kungälv used bonded stone for construction of houses, however, most of the fortress is still intact. The castle is currently a Museum and is open to tourists in the summer.