The distance from S-Petersburg to main defense positions of Mannerheim Line is near to 60-90 kms. For Summa region more convenient way is: along Scandinavia highway run to st.Gavrilovo (Kemerä) turn, than along cart-track to Kamenka up to 65.5 heigh.
For the Leipäsuo area - along Scandinavia highway run to lakes Podgornye (Taasionlammel) and make a left turn to country road.
It is necessary to tell, there is the shooting range and in week-days Summakulä and Summajarvi areas are frequently blocked by military posts. Be carefull...