The Crișul Negru (Black Criș) (Romanian), () is a river in western Romania (Transylvania) and south-eastern Hungary (Békés County). The river has its source in the western Apuseni Mountains of Romania. Flowing through the Romanian towns of Ștei and Beiuș and crossing the border of Hungary, the river, now called Fekete-Körös, joins the Fehér-Körös a few kilometres north from Gyula to form the Körös river.Planul de management al riscului la inundații - Administrația Bazinală de Apă Crișuri, p. 7 In Romania, its length is and its basin size is . Part of the water from the river Crișul Repede is diverted towards the Crișul Negru by the Criș Collector Canal.

Hydronymy The name of this river comes from earlier Dacian Krísos, which meant "black",Katičic', Radislav. Ancient Languages of the Balkans, Part One. Paris: Mouton, 1976: 150. making this a doublet (cf. Bulg čer "black", Old Church Slavonic čǐrnǔ, Old Prussian kirsnan, Albanian sorrë "raven") with Romanian negru "black". The upper course, upstream from the confluence with the Crișul Băița, is sometimes called Crișul Poienii.

Towns and villages The following towns and villages are situated along the Crișul Negru, from source to mouth: Vașcău, Ștei, Rieni, Drăgănești, Tărcaia, Beiuș, Șuncuiuș, Uileacu de Beiuș, Șoimi, Căpâlna, Tinca, Batăr, Avram Iancu, Zerind in Romania, and Sarkad in Hungary.

Tributaries The following rivers are tributaries to the Crișul Negru (from source to mouth):

Left: Criștior, Pârâul Țarinii, Briheni, Valea Mare (Cusuiuș), Tărcăița, Finiș, Căldărești, Șerpoasa, Valea Mare (Șuncuiș), Arman, Hălgaș, Fieghiu, Poclușa, Crișul Mic, Rătășel, Beliu, Răchest, Teuz Right: Crișul Nou, Crișul Băița, Valea Neagră, Crăiasa, Crișul Pietros, Talpe, Mizieș, Nimăiești, Ioaniș, Valea Roșie, Prisaca, Săliște, Holod, Pusta, Saraz, Valea Nouă

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