Fortresses and bunkers on the map: over 100 military heritage sites in Finland, Salpa Line included. By municipality, free and without sign-up.
144 places in
The map shows 7 fortresses & bunkers in Kouvola. This is the number of places in this service, not an official total for the municipality.
6 places have parking within 500 metres (typically 150 m) and 6 places have a bus stop nearby (typically 200 m). Distances are measured to the nearest parking area and bus stop marked on the map.
Ruotsulan redutti is 6 km from the centre. The farthest is about 24 km away.
Liikkalan linnake, Utin linnoitus, Jaalan redutti, Keltin redutti. These have their own description, a photo or a Wikipedia article, so the place page offers background beyond the location alone.