Lake Undozero Lake Undozero Lake Undozero () is a freshwater lake, located in the west of Plesetsky District of Arkhangelsk Oblast in Russia. It is one of the biggest lakes in Arkhangelsk Oblast and the second biggest one in Plesetsky District. The area of the lake is , and the area of its basin is . Lake Undozero is the source of the Undosha River, which belongs to the river basin the Onega River and thus to the White Sea basin. The lake has a sophisticated shape and contains a number of islands. The source of the Undosha is in the south-western
Vytegorsky District Vytegra. Population: 31,757 (2002 Census); The population of Vytegra accounts for 38.6% of the district's total population. The northwestern border of the district is the shore of Lake Onega, and the area of the district is divided between several drainage basins. The western and the central parts belong to the basins of the rivers flowing into Lake Onega, most notably the Vytegra, the Vodla, the Andoma, and the Megra. Lake Onega belongs to the basin of the Neva River. From the east, the Andoma Hills separate the basin of Lake Onega from the basins of the Kovzha and the Kema