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 Onega of Karelia (about 270,000 citizens) founded in 1703 by Peter I to exploit the natural ore deposits. Petrozavodsk area contains a large number of historical monuments, such as Architectural ensemble Round Square (end of 18th century) and gymnasium building of 1790. The embankment of Lake Onega contains a series of sculptures, many of which were presented as gifts from the twin cities. Kondopoga is known from 1495 and contains the Uspenskaya (Assumption) Church built in 1774. This construction is one of the tallest wooden churches of the Russian North. There are two carillons in the city, with 23 and 18