Koros-er River

General data
- Water type: River
- Progression: Tisza -> Danube -> Black sea -> Mediterranean Sea -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: Europe
- Countries: Hungary, Serbia
Description
The Körös-ér, Kireš or Kereš, is a river in southern Hungary and northern Serbia, a 90-kilometre-long right tributary to the Tisa river. It flows entirely within the Bačka border region: 37 km in Hungary, 15 km as a border river and 29 km in Serbia (roughly).