The Lake Lake Sapsho

the bottom of lake sapsho

lake sapsho situated in north-west of smolensk oblast, 120 km (75 mi) north of smolensk. on sloboda upland (russian: Слободская возвышенность) part of smolensk–moscow upland (russian: Смоленско-Московская возвышенность). largest lake in smolenskoye poozerye national park. there 2 eskers. 1 of them partly destroyed glacial flows. caused arising of 5 of 6 islands. lake sapsho divided deep northern , shallow southern parts. other esker forms western border of lake. northern side abrupt. on contrary, eastern , southern sides gentle. bottom of lake here not steep. northern basin divided western , eastern parts long underwater spit. depth here less 5 m (16 ft). ends long shoal depth less 1 m (3 ft 3 in), so-called underwater island or sitnik .

lake sapsho drains rivers of western dvina (russian: Западная Двина) basin. in spring, middle or end of april, water volume increases because of melting snow. melting of ice on lake takes 10 15 days more, , ends in late april or may. swimming season opens in late june or july, , finishes in late july or august. lake covers ice in 2nd or 3rd decade of november. sometimes, happens in middle of december. thickness of ice 50 cm (20 in) 70 cm (28 in). in severe winters may become 90 cm (35 in). period of freeze-up 150 170 days.

surface elevation of lake petrakovskoye , lake sapsho