When adding a photo here on TrekEarth, you have a default list of "Swedish states" to chose from. These "states" here on TE are the traditional provinces, "landskap" in Swedish. These are the historical, geographical and cultural regions and have no administrative purpose at all. They were replaced already in 1634 by a new subdivision of Sweden into counties "län".
The borders around the Gota River estuary were established in 1101, in the so called "Three Kings Meeting" when Sweden was granted a corridor to the sea, and the total area around the estuary. The area about 10 km south of the estuary, Halland, belonged to Denmark and the area about 10 km north of the estuary, Bohuslän, belonged to Norway.
In 1397 these Scandinavian countries were united (the Kalmar Union) and there was a relative peace. Since Sweden left the union in 1523, the Danes wanted this area back. The strongly fortified city of Gothenburg was founded in 1621, to protect this estuary. Finally, both Halland and Bohuslän became Swedish at the treaty of Roskilde in 1658.
Since Sweden was subdivided in counties since 1634, a new county called Göteborgs och Bohus län was established in 1680. This county included both the city of Gothenburg and the old province of Bohuslän (note the spelling). The old province of Västergötland had already been divided into Älvsborgs län and Skaraborgs län.
In 1998 the new county of Västra Götalands län, consisting of all these three "län" was established.
This is the short explanation why so many people that add pictures from Gothenburg here on TE, very often misplace Gothenburg. They believe it is in the historical province of Bohuslän, when it is in fact always was in Västergötland.
However, this picture is from the northern part of the city of Gothenburg. It is from Sillvik (Herring Bay) and this part of the Hising Island was never part of Västergötland. This place was Norway until 1658 and it still belongs to the old province of Bohuslän!
Some complementary pictures from the same place are added as workshops!