Bohus Fortress, or Bohus Fästning, is a fortress from the 13th century at Kungälv in Sweden. Construction began under king Håkon VI of Norway, who named it "Bagahus", later shortened to "Båhus". Strategically located where Göta älv divides to surround the island of Hisingen, it was for a long time the central installation for defense of southern Norway against Sweden. The fortress passed from Norway to Sweden by the Treaty of Roskilde in 1658 together with the province of Bahusia, Båhuslen or Bohuslän, which literally means the "Fief of Bohus".
After Denmark-Norway had lost Bohus a new fortress, Fredriksten, was constructed in Fredrikshald on the new border against Sweden. Bohus had served its role as a border fortress but after being captured by Sweden, it lost its strategic value to the Älvsborg Fortress at Gothenburg and the new fortress Carlsten that was being erected at Marstrand.
BohusFortress (also Baahus or Båhus, originally: Bagahus) lies along the old Norwegian - Swedish border in Kungälv, Bohuslän, Sweden, north east from Hisingen where the Göta river splits into two branches (20 kilometres north of Gothenburg).
BohusFortress (Norwegian: Båhus Festning and Swedish: Bohus Fästning) construction began in 1308 under King Håkon V Magnuson, king of Norway from 1299 until 1319.
Since BohusFortress no longer lay on the border, it was of minimal future use to Sweden, which relied on the existing Älvsborg Fortress at Gothenburg and a new CarlstenFortress erected at Marstrand.
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