Salpa Line
The Salpa Line (Finnish: Salpalinja, literally Latch line; Swedish: Salpalinjen), or its official name, Suomen Salpa (Finland's Latch), is a bunker line on the eastern border of Finland. It was built in 1940–1941 during the Interim Peace between the Winter War and the Continuation War and further in 1944 to defend Finland against a possible Soviet invasion.