As title says: I think I know where the fictitious islands lies and where the game takes place.
The islands lies in Bottniska Viken (The Gulf of Bothnia) outside the landscape Ångermanland.
The administration weapon for Ångermanland is three silver salmons.
I found this on a Emergency Services building/firestation in Klinte:
This is the administration weapon for Ångermanland:
The chart where Ångermanland lies in Sweden:
I have not yet checked with the other stations if they have the same emblem.