The city of Karlskrona is spread over 30 islands in the eastern part of Blekinge County, in the Baltic Sea, Trossö being the main one. It was founded in 1680 when the Royal Swedish Navy was relocated from the Stockholm area to the Trossö island, because at the time Sweden was the dominant military power in the Baltic sea region, but needed a better strategic location against Denmark, since southern parts of Sweden had been conquered only a few decades before.
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