Koros-er River

Water type: River
Basin: Tisza -> Danube -> Black sea
Continent: Europe
Climate: Continental

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).