Lake Ladoga Stolbovo, the northern and western coast was ceded by Russia to Sweden. In 1721, after the Great Northern War, it was restitution to Russia by the Treaty of Nystad. Later, in 1812–1940 the lake was shared between Finland and Russia. According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted. However, both Soviet Russia and Finland had flotillas in Ladoga (see also Finnish Ladoga Naval Detachment). After the Winter War (1939–40) according to the Moscow Peace Treaty, Ladoga, previously shared with Finland, became an internal basin of the Soviet Union. During the Continuation
Lake Ladoga The Germanic toponym (Aldeigja → Aldoga) was soon borrowed by the Slavic population and transformed by means of the Old Russian metathesis "ald- → lad-" to . The Old Norse intermediary word between Finnish and Old Russian word is fully supported by archeology, since the Scandinavians first appeared in Ladoga in the early 750s, that is, a couple of decades before the Slavs. Other theories about the origin of the name derive it from "wave" and "wavy"; or from the Russian dialectal word алодь, meaning "open lake, extensive water field". Eugene Helimski by contrast, offers an etymology rooted in German.