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,
Onega Canal of the lake. At the mouth of the canal, in the selo of Voznesenye, a memorial obelisk has been erected. The canal lost its significance after Mariinsk Canal System was reconstructed and became Volga-Baltic Waterway. Onezhsky Canal was not reconstructed and became too shallow for larger boats. It is still navigable, but not used for regular navigation. Two rivers, Vozheroksa and Oshta, tributaries of Lake Onega, cross the canal. from the Vytegra, the canal crosses Lake Megrskoye, a large freshwater lake. There is weak current in the canal in the direction of the Svir. Onega Canal The Onega Canal ()