What was the name of the defensive line that the Soviet troops stormed in the war with the Finns?

Its name is the Mannerheim Line. This name for the chain of fortifications appeared at the beginning of the Soviet-Finnish campaign. It was given in honor of the Finnish Supreme Commander-in-Chief. The construction of the line began shortly after Finland gained independence in 1918 and lasted until the end of 1939. It had a length of about 132-135 km and passed over the land of the Karelian Isthmus from the waters of the Gulf of Finland to the waters of Lake Ladoga. During the war, it took the Soviet troops 2 months to overcome it.