Bohus Fortress lies along the old Norwegian–Swedish border in Kungälv, Bohuslän, Sweden, north east from Hisingen where the Göta river splits into two branches north of Gothenburg). It commands the surrounding area from a cliff 40 m high, with the river forming a natural moat around it.
The construction of Bohus Fortress began in 1308 under King Haakon V Magnuson, king of Norway from 1299 to 1319. Håkon V also initiated construction of Norwegian fortresses at Akershus and Vardøhus as part of a broader defensive policy. At the time Bohuslän was Norwegian territory and served as the main Norwegian defence against Sweden, along the coast as well as the strong point for the Bohuslän region from 1308 to 1658.
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