Salpa line, where is it?

It is in Finland.

©Salpalinja-museo, Miehikkälä Tiedotustilaisuus

Geographically, Salpa-Linius extends from the northern coast of the Gulf of Finland to the southern coast of the Barents Sea along the border with the USSR (Russia). The greatest concentration of fortifications is a plot from the Suomen-Lahti Gulf (Gulf of Finland) to Lake Kivi-Yarve. Crossing the Finnish border from Russia anywhere, you automatically cross Salpa-Linja. So there is no way to pass by...

It is easy to find, you just need to scan road pointers and look for something like Salpa-asema, Museum, Bunkkeri and etc. Good luck...

Field gun of the First World War at the Virolahti Museum