Lake Kenozero Lake Kenozero Lake Kenozero () is a freshwater lake, located in the south-west of Plesetsky District of Arkhangelsk Oblast in Russia. It is one of the biggest lakes in Arkhangelsk Oblast and the biggest one in Plesetsky District. The area of the lake is , and the area of its basin is . Lake Kenozero is the source of the Kena River, a tributary of the Onega River. The lake thus belongs to the Onega basin and the White Sea basin. The lake is located close to the border of Arkhangelsk Oblast and Republic of Karelia. It belongs to Kenozersky
Lake Ladoga were connected by a strait or a river outlet at least until the formation of the River Neva, and possibly even much later, until the 12th century AD or so. At 9,500 BP, Lake Onega, previously draining into the White Sea, started emptying into Ladoga via the River Svir. Between 9,500 and 9,100 BP, during the transgression of Ancylus Lake, the next freshwater stage of the Baltic, Ladoga certainly became part of it, even if they hadn't been connected immediately before. During the Ancylus Lake subsequent regression, around 8,800 BP Ladoga became isolated. Ladoga slowly transgressed in its southern part