Bolshoy Uzen River
General data
- Name: Bolshoy Uzen River
- Water system: Planet Earth
- Water type: River
- Progression: Kamys-Samar Lakes -> Planet Earth
- Climates: Continental
- Continents: Europe, Asia
- Countries: Kazakhstan, Russia
The Bolshoy Uzen (Russian: Большой Узень, lit. 'Big Uzen') or Ulken Uzen (Kazakh: Үлкен Өзен, lit. 'Big River' Ülken Özen or Kazakh: Қараөзен, lit. 'Black River') is a river in Saratov Oblast of Russia and West Kazakhstan Province of Kazakhstan. It is 650 kilometres long, with a drainage basin of 15,600 square kilometres. The town of Novouzensk is situated at the Bolshoy Uzen. The river is used for water supply and irrigation.