Koros

Körös 

(also Hármas Körös), a river in Rumania and Hungary; left tributary of the Tisza. Length, 580 km; basin area, 27,500 sq km.

The Körös rises in the mountains of Western Rumania (the Bihor massif and the Metalici range) in two sources—the Cri§ul Alb and the Cri§ul Negru. From their confluence to its mouth the Körös flows through the Alfold plain. Within this plains sector the riverbed has been straightened and channeled, locks have been installed, and dikes have been erected. There are flash floods during the warm part of the year, and the least flow takes place in the winter months. The average water discharge at the river’s mouth is 100 m³/sec. The principal tributaries are the Sebes Körös and the Hortobágy. Canals that drain the swampy sections of the Alföld empty into the Körös. There is navigation in its lower course. The cities of Brad (Rumania), Gyula, Békés, Gyoma, and Kunszentmárton (Hungary) are located on the Körös.