Lake Lacha Lake Lacha Lake Lacha () is a freshwater lake, located in the south of Kargopolsky District of Arkhangelsk Oblast in Russia, south of the town of Kargopol. It is the largest lake in Arkhangelsk Oblast, with a surface area of and a basin area of . Lake Lacha is the source of the Onega River, one of the major waterways of the White Sea basin. The etymological origin of the name is unclear. The river basin of Lake Lacha includes the southern and western parts of Kargopolsky District of Arkhangelsk Oblast, as well as north-west of Vologda Oblast. In particular,
Lake Kubenskoye lake. Administratively, the lake is divided between Vologodsky District (west), Sokolsky District (southeast), and Ust-Kubinsky District (east) of Vologda Oblast. In terms of the area, Lake Vozhe is the fourth natural lake of Vologda Oblast (behind Lake Onega, Lake Beloye, and Lake Vozhe) and the fifth lake (also behind the Rybinsk Reservoir). The area of the basin of the lake is . The basin occupies much of the central and northern parts of Vologda Oblast, as well as parts of Konoshsky District of Arkhangelsk Oblast. The major tributary of the lake is the Kubena River. The lake was settled by