Significant water reserves are concentrated in the lakes. In Russia, more than 2.5 million. Lakes. The largest lake - the Caspian, Ladoga, Onega, Lake Baikal. The Caspian Sea - the largest lake in the world by area, and the deepest - Baikal. Lake located very uneven. Especially a lot of them in Vilyuiskaya basin, on the West Siberian Plain and the northwest European plain - in Karelia. All of these areas are in conditions of excess moisture. To the south, in the steppes and semi-arid climate with them, the number of lakes decreases sharply, and many lakes are salty or brackish water. Salt are those undrained large lakes as the Caspian Sea, as well as Elton and Baskunchak, where it produces table salt.
Vary the lakes and the origin of the depressions. Russian lakes of tectonic origin are located in depressions and dips of the earth's crust. The largest tectonic lake Baikal is located in the ridge and therefore reaches a depth of 1,637 m.
Glacial-tectonic lake basin have resulted from processing glacier tectonic depressions the earth crust: Imandra, Ladoga, Onega. Kamchatka and the Kuril lake mainly of volcanic origin. In the north-west European Plain origin of lake basins associated with continental glaciation. Many basins are located between the moraine hills: Seliger, Valdai.
Water of freshwater lakes used for human consumption. On the shores of many lakes are numerous motels. In Russia allocated nine lake districts: Northwest, the Azov-Black Sea, the North Caucasus, the Caspian, West Siberia, Altai, Transbaikalia, Nizhneamurskaya, Yakutia and Kamchatka.