Sestra River (Leningrad Oblast)

The Sestra as Finnish- Soviet border river in the 1920s

Template: Infobox River / Obsolete

The Sestra (Russian Сестра ( " sister "); Finnish Rajajoki ( " border river " ), Siestarjoki; Swedish Systerbäck ( " sister Bach" ) ) is a river on the Karelian Isthmus in Russia's Leningrad Oblast and the territory of St. Petersburg. It has a length of 74 km and a catchment area of 393 km ².

The Sestra, the historical border between the provinces of Karelia and Ingria dar. The Treaty of Nöteborg the river in 1323 was fixed as the boundary between Sweden and Russia. After Altfinnland 1721 fell to Russia, he was a border river between the Russian province of Vyborg and St. Petersburg, from 1812 to 1917 then between Russia and the Grand Duchy of Finland, 1917-40 and 1941-44 and then. Between the Soviet Union and the independent Finland

Until the beginning of the 18th century, the Sestra culminated in the Gulf of Finland. After 1714 it was then impounded by the construction of a dam to a lake to supply the ammunition factory in the newly founded Sestrorezk with water. The resulting lake ( Sestrorezki Razliv ) today has a size of 10.6 square kilometers and is approximately 2 m deep. It is separated by artificially reclaimed sand dunes from the sea, the water level is regulated via a 4.8 km long canal to the sea.