Lake Kovzhskoye Lake Kovzhskoye Lake Kovzhskoye () is a freshwater lake, located in the center of Vytegorsky District of Vologda Oblast in Russia. It is one of the biggest lakes in Vologda Oblast and the second biggest one in Vytegorsky District behind Lake Onega. The area of the lake is , and the area of its basin is . The main tributary of the lake is the Iles River. Lake Kovzhskoye is the source of Kovzha River, one of the principal tributaries of Lake Beloye. The lake belongs to the basins of the Volga and the Caspian Sea. The lake has a
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