Lacha

a lake at the source of the Onega River, in Arkhangelsk Oblast, RSFSR. Area, 334 sq km. It is a shallow lake with a maximum depth of approximately 5.4 m; it has a silty peat bottom and swampy shores. Lake Lacha freezes over from November to May. Several rivers, including the Svid’, Kovzha, and Lekshma, empty into Lake Lacha. The Onega River originates from the lake. The lake is navigable.