Marstrand

Marstrand () is a seaside locality situated in Kungälv Municipality, Västra Götaland County, Sweden. It had 1,320 inhabitants in 2010. The town got its name from its location on the island of Marstrand. Despite its small population, for historical reasons Marstrand is often referred to as a city.

Carlsten () is a stone fortress located at Marstrand, on the western coast of Sweden. The fortress was built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s. == History == thumb|left|200px| Tower. The highest part of the fortress. After peace in Roskilde in 1658, Bohuslän and

1719 Dano-Norwegian siege

18c. Swedish autonomous island territory

1677 battle between Swedish and Norwegian forces