The totally consistent part of the fortification is situated between the Gulf of Finland and Lake Kivijärvi at Luumäki. About 90 per cent of the permanently fortified constructions are there. From Lake Saimaa to Lake Pielinen in North Karelia the Salpa-line lean to waterways, especially lakes. From Pielinen up to the level of Salla in Lapland, only the most important directions of roads were fortified and blocked with field fortified positions.
In the Salpa-line there are about 720 reinforced concrete bunkers and some tunnel caves quarried into rocks. The field fortification equipment are made of wood and soil, altogether about 3000 pieces.
Trenches dug with shovels or quarried into rock, were made for about 350 kilometres. Stone antitank obstacles were made for over 200 kilometres. They include more than 350000 single stones, that weigh at least three tons each. There were also 130 kilometres dug ditch antitank obstacles. Barbed wire obstacles were made for about 315 kilometres.
The typical permanet equipment in the position is a machine gun and accomodation bunker, of which 170 were made. To build one, for instance, 45 tons steel and 5000 sacks of cement (50 kg) were needed. Altogether to build a massive bunker had to be transferred about 10000 tons different kinds of material, if put on trucks in those days, it meant 3000 truckloads.
After the war all equipment, which were removable, were pulled down and transfered to the stores or other uses. Now one can see still concrete bunkers, stone antitank obstacles and trenches, camouflaged for more than 70 years.
Some parts of Salpa-line are now restored as museums and destinations of hikes.
Written by Terho Ahonen