At the northern bank of the Svir River () the Finnish army had prepared a defence in depth area which was fortified with strong-points with concrete pillboxes, barbed wire, obstacles and trenches. After the Winter War, the Salpa Line was built behind the 1940 border with concrete bunkers in front of the Kymi river.
The Finnish army fortified a depth-defence area on the northern bank of the Svir River, including strongpoints with concrete fortifications, barbed wire, obstacles, and trenches. After the Winter War, the Salpa Line was built behind the 1940 border using concrete bunkers in front of the Kymi river.