The Crișul Negru (Romanian), is a river in western Romania (Transylvania) and south-eastern Hungary. The river starts at the confluence of headwaters Crișul Poienii and Crișul Băiței in the western Apuseni Mountains. It flows through the towns Ștei and Beiuș in Romania. One its tributaries is the small Roșia River. 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. Part of the water from the river Crișul Repede is diverted towards the Crișul Negru by the Criș Collector Canal.
The Abucea is a left tributary of the river Mureș in Romania. It discharges into the Mureș in Abucea.
The Almaș River is a tributary of the Drauț River in Romania.
The Cârțibașu River is a tributary of the Cârțibașu Mare River in Romania.
The Cobășel River or Cobăcel River is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Șanț.
The Cocora River is a tributary of the Ialomiţa River in Romania.
The Brândușa River is a tributary of the Ialomiţa River in Romania.
The Cigher River is a left tributary of the river Crișul Alb in Romania. It discharges into the Crișul Alb near Zărand. The Tauț dam is located on the Cigher River.
The Conțu River is a right tributary of the river Sadu in Romania.
The Cârligele River is a tributary of the Sadu River in Romania.
The Bolnovăț River is a tributary of the Bârzava River in Romania.
The Cristești River is a tributary of the Sebeş River in Romania.
The Costișa River is a tributary of the Diudiu River in Romania.
The Borzontul Mic River is a left tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș near Joseni.
The Cioara River is a left tributary of the river Mureș in Romania. It discharges into the Mureș near Tărtăria.
The Ciugud River is a tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in Inoc.
The Cheița River is a headwater of the Teleajen River in Romania. The upper reach of the river is also known as Pârâul Berii. The Cheița River is sometimes considered to be the upper course of the Teleajen River.
The Almăşeni River is a tributary of the Iara River in Romania.
The Chicera River is a tributary of the Cârțibașu Mare River in Romania.
The Cioha River or Țoha River is a tributary of the Arieşul Mic River in Romania.
