The Sestra (; or ; ) is a

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

in Vsevolozhsky and Vyborgsky Districts of

Leningrad Oblast Leningrad Oblast ( rus, Ленинградская область, Leningradskaya oblast’, lʲɪnʲɪnˈgratskəjə ˈobləsʲtʲ, , ) is a federal subjects of Russia, federal subject of Russia (an oblast). It was established on 1 August 1927, a ...

and

Kurortny District Kurortny District (russian: Куро́ртный райо́н) is a district of the federal city of St. Petersburg, Russia, located on the Karelian Isthmus along the northern shore of the Gulf of Finland. As of the 2010 Census, its populatio ...

Saint Petersburg Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), i ...

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

. The length of the Sestra is , and the area of its basin is . The Sestra flows over the

Karelian Isthmus The Karelian Isthmus (russian: Карельский перешеек, Karelsky peresheyek; fi, Karjalankannas; sv, Karelska näset) is the approximately stretch of land, situated between the Gulf of Finland and Lake Ladoga in northwestern ...

. The source of the river is in swamps west of the settlement of

Vaskelovo Vaskelovo (russian: Васкелово) is a rural locality on Karelian Isthmus, in Vsevolozhsky District of Leningrad Oblast, and an important station of the Saint Petersburg-Hiitola railroad, being the final destination of many suburban electri ...

, and the Sestra flows in the general direction south, having its mouth in the town of

Sestroretsk Sestroretsk (russian: Сестроре́цк; fi, Siestarjoki; sv, Systerbäck) is a municipal town in Kurortny District of the federal city of St. Petersburg, Russia, located on the shores of the Gulf of Finland, the Sestra River ...

. It used to fall into the

Gulf of Finland The Gulf of Finland ( fi, Suomenlahti; et, Soome laht; rus, Фи́нский зали́в, r=Finskiy zaliv, p=ˈfʲinskʲɪj zɐˈlʲif; sv, Finska viken) is the easternmost arm of the Baltic Sea. It extends between Finland to the north and E ...

until the early 18th century. After the construction of a

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use ...

for the needs of the

munitions Ammunition (informally ammo) is the material fired, scattered, dropped, or detonated from any weapon or weapon system. Ammunition is both expendable weapons (e.g., bombs, missiles, grenades, land mines) and the component parts of other weap ...

factory in Sestroretsk, a part of the river was turned into a

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

called Sestroretsky Razliv (Sestroretsk Overflow), deep with an area of . Since then, the Sestra River has been flowing into this reservoir. The Sestroretsk Overflow is separated from the Gulf of Finland with a ridge of artificial

sand dune A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, fl ...

s. Excess water is dumped into the Gulf of Finland through a

canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow un ...

, which is long. The Sestra served as a natural border between Russia and

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

(1323–1617) and between Russia and

Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B ...

(1812–1940). It currently serves as a border between Vsevolozhsky (east, formerly Soviet Union) and Vyborgsky (west, formerly Finland) districts of Leningrad Oblast.

References

{{coord, 60, 21, 33, N, 30, 04, 24, E, region:RU-LEN_type:waterbody_source:kolossus-itwiki, display=title Karelian Isthmus Geography of Karelia Rivers of Leningrad Oblast Rivers of Saint Petersburg Drainage basins of the Baltic Sea