thickness of ice is from to . In most severe winters it may become up to . The period of freeze-up is from 150 to 170 days. The Rivers Inflow rivers are the Sapshanka () in the south and the Sapsha () in the west. The outflow river is the Sapsha in the east. The Sapsha connects Lake Sapsho and Lake Petrakovskoye (). Both lakes have similar surface elevation. The area of Lake Petrakovskoye is . During the period of melting snow in spring and heavy showers in summer Lake Petrakovskoye fills with water faster than Lake Sapsho. Therefore, the Sapsha changes its flow. Usually changing of flow of the Sapsha happens several times a year. The Islands There 6 islands on the lake. Four of them are large: Chernetsky / Monk Island (), Raspashnoy / Border Island (), Bagryany / Crimson Island (), Dlinny / Long Island (). Two of them are small: Dubovy / Oak Island () and Lyubvi / Island of Love (). Five of them are located in line along one of two eskers. References Sapsho Sapsho Tourist attractions in Smolensk Oblast