The Körös ([ˈkørøʃ]; Romanian: Criș, German: Kreisch) is a river in eastern Hungary and western Romania. Its length is 128.6 km (79.9 mi) from the confluence of its two source rivers Fehér-Körös (Crișul Alb) and Fekete-Körös (Crișul Negru) to its outflow into the Tisza. Its drainage basin area is 27,537 km2 (10,632 sq mi).:22 It has three source rivers, all of which have their origin in the Apuseni Mountains in Transylvania, Romania: Crișul Alb (Fehér-Körös), Crișul Negru (Fekete-Körös) and Crișul Repede (Sebes-Körös). The confluence of the rivers Fehér-Körös (Crișul Alb) and Fekete-Körös (Crișul Negru) is near the town Gyula. The Körös downstream from Gyula is also called the Kettős-Körös (Hungarian for "double Körös"). 37.3 km further downstream, near Gyomaendrőd, the Sebes-Körös (Crișul Repede) joins the Criș/Körös. The section downstream from Gyomaendrőd is also called the Hármas-Körös (Hungarian for "triple Körös"). The Körös flows into the Tisza River near Csongrád.
The Körös near Kunszentmárton
|Counties||Békés, Jász-Nagykun-Szolnok, Csongrád|
|Source||Confluence of headwaters Crișul Alb and Crișul Negru|
|- location||near Gyula|
|- elevation||85 m (279 ft)|
|80 m (260 ft)|
|Length||128.6 km (79.9 mi)|
|Basin size||27,537 km2 (10,632 sq mi)|
|- average||100 m3/s (3,500 cu ft/s)|
|- left||Crișul Alb (Fehér-Körös), Crișul Negru (Fekete-Körös)|
|- right||Crișul Repede (Sebes-Körös)|
|Progression||Tisza→ Danube→ Black Sea|
It was known in antiquity as the "Chrysus", Crisus, Crisia, Grisia, or Gerasus, while an archaic German name is Kreisch.