The Oster River (Ukrainian: Остер) is a river in the northern Ukrainian oblast of Chernihiv. The river is the left branch of the Desna River. 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, which flows southwest from Kiev into the Dnieper River. Important towns and villages on the river include: Nizhyn, Kozelets, Roslavl and Oster.
The watershed of the Oster River
|⁃ location||Chernihiv Oblast, Ukraine|
|Length||199 km (124 mi)|
|Basin size||2,950 km2 (1,140 sq mi)|
|⁃ average||3,2 m³/s|
- "Остёр (река в Черниговской обл.)" (in Russian). Большая Советская Энциклопедия. Retrieved 2019-05-10.
- "Остер" (in Ukrainian). Водный туризм Украины. 2002. Retrieved 2019-05-10.
- "NÉVJEGYZÉK-SZÓTÁR az UKRAJNA TERMÉSZETI FÖLDRAJZA tantárgyhoz" (pdf) (in Hungarian). II. Rákóczi Ferenc Kárpátaljai Magyar Főiskola. Retrieved 2019-05-10.
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