The Oster () 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 the northern

Ukrainian Ukrainian may refer to: * Something of, from, or related to Ukraine * Something relating to Ukrainians, an East Slavic people from Eastern Europe * Something relating to demographics of Ukraine in terms of demography and population of Ukraine * So ...

oblast of

Chernihiv Chernihiv ( uk, Черні́гів, , russian: Черни́гов, ; pl, Czernihów, ; la, Czernihovia), is a city and municipality in northern Ukraine, which serves as the administrative center of Chernihiv Oblast and Chernihiv Raion within ...

. The river is a left tributary of the

Desna River The Desna (russian: Десна́; uk, Десна) is a river in Russia and Ukraine, a major left-tributary of the Dnieper. Its name means "right hand" in the Old East Slavic language. It has a length of , and its drainage basin covers .

. It is approximately 199 km long and its basin area is 2,950 km². It is connected by canals and streams with the

Trubizh River The Trubizh (, russian: Трубе́ж) is a river entirely located in Ukraine, a left tributary of Dnieper. It falls into the Dnieper's Kaniv Reservoir (named after Kaniv). It is long, and has a drainage basin of .Kyiv Kyiv, also spelled Kiev, is the capital and most populous city of Ukraine. It is in north-central Ukraine along the Dnieper, Dnieper River. As of 1 January 2021, its population was 2,962,180, making Kyiv the List of European cities by populat ...

into the

Dnieper River } The Dnieper () or Dnipro (); , ; . is one of the major transboundary rivers of Europe, rising in the Valdai Hills near Smolensk, Russia, before flowing through Belarus and Ukraine to the Black Sea. It is the longest river of Ukraine and B ...

. Important towns and villages on the river include:

Nizhyn Nizhyn ( uk, Ні́жин, Nizhyn, ) is a city located in Chernihiv Oblast of northern Ukraine along the Oster River. The city is located north-east of the national capital Kyiv. Nizhyn serves as the administrative center of Nizhyn Raion. It ...

Kozelets Kozelets ( uk, Козелець ) is an urban-type settlement in Chernihiv Raion, Chernihiv Oblast (province) of northern Ukraine. It hosts the administration of Kozelets settlement hromada, one of the hromadas of Ukraine. Kozelets is located on t ...

Roslavl Roslavl (russian: Ро́славль, ) is a town and the administrative center of Roslavlsky District in Smolensk Oblast, Russia. It is a road and rail junction and a market town. Population: Climate Roslavl has a warm-summer humid continenta ...

and

Oster Oster ( uk, Осте́р ; russian: Остёр, Ostyor) is a city located where the Oster River flows into the Desna, in Chernihiv Raion, Chernihiv Oblast of Ukraine. Oster hosts the administration of Oster urban hromada, one of the hromadas ...

References

{{Ukraine-river-stub Rivers of Chernihiv Oblast