Hill Oikarainenvaara lies near Kuusamontie at the intersection of Permantokoskentie. On this hill area there is a well-equipped defense station, which is part of the Ringwall Defense Line, built in 1944. The German-built Trench / Defense Line is 65 meters long and lined north-west. The line was 1.5 by 2 meters wide and 1 1.5 meters deep.
At the southeast end of the trench are two concrete cast machine gun bunkers with external dimensions of approximately 2 x 2 meters. The inside of the bunker is about 1.5 x 1.5 meters, the width of the concrete ring is about 80 cm and the depth of the bunker is less than two meters. The bunkers were equipped with heavy machine guns.
Area also includes other ruins from the Continuation War.