Ladoga, Lake, the largest lake in Europe. Before 1940 Lake Ladoga was divided between Finland and the Soviet Union; it now lies entirely within Russia. It is 130 miles (210 km) long and up to 80 miles (130 km) wide, with a total area of about 7,000 square miles (18,000 km2). Its greatest depth is 730 feet (223 m). More than 70 rivers flow into Lake Ladoga, and a vast network of rivers and canals connects it with the Baltic Sea, the White Sea, and the Volga river system. The most important of the rivers is the Neva.

Fishing is extensive along the lake's southern shore. Lake Ladoga is frozen for several months of the year. During the German siege of Leningrad in World War II, supplies were brought to the city by truck over the ice of the lake.