The Salpa Line (Salpalinja, salpa being the Finnish word for latch) is a fortification line dating from the Second World War. The fortification line’s structures can also be seen in the Lappeenranta area. You can explore the fortifications along the hiking routes on your own or join a guided tour.
After the Winter War had ended in March 1940, there was growing anxiety about defending the new borders, after the fortifications on the Karelian Isthmus had been lost. The construction of a massive defence line, along the eastern border of Finland, was initiated. Peace was made a few years later, before the battles ever advanced to the Salpa Line. This is why the bunkers remain, to this day.