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.
At the northern bank of the Svir River (), the Finnish army had prepared a layered defence area which was reinforced with sturdy positions equipped with concrete fortifications, barbed wire, barriers and ditches. After the Winter War, the Salpa Line was constructed behind the 1940 border with concrete bunkers in front of the Kymi river.