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 Ampoi is a river in the Apuseni Mountains, Alba County, western Romania. It is a right tributary of the river Mureș. It flows through the town Zlatna, and joins the Mureș near Alba Iulia. It is fed by several smaller streams, including Grohaș, Trâmpoiele, Ruzina, Valea Mică, Galați, Bebu and Purcăreți on the left side and Valea Petrei, Vâltori, Feneș, Valea lui Bibaț, Valea Albinei, Ampoița and Ighiu on the right side.
The Cladova River is a right tributary of the river Mureș in Romania. It discharges into the Mureș near Păuliș.
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 Breazova River or Pârâul Cracului is a tributary of the Galbena River in Romania.
The Coșna River or Bancu River is a tributary of the Dorna River in Romania. The upper reach of the river is also known as Coșnița River.
The Boiu River is a right tributary of the river Mureș in Romania. It discharges into the Mureș in Folt.
The Călimănel River is a right tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș near Toplița. It starts at the confluence of headwaters Călimănelul cel Limpede and Călimănelul cel Tulbure.
The Boz River is a right tributary of the river Mureș in Romania. It discharges into the Mureș near Boz.
The Certej River (Hungarian:Csertés-patak) is a right tributary of the river Mureș in Romania. It discharges into the Mureș near Deva.
The Borzontul Mare River is a left tributary of the river Mureș in Romania. It discharges into the Mureș near Joseni. The upper reach of the river is also known Putna River.
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 Conop River is a right tributary of the river Mureș in Romania. It discharges into the Mureș in Conop.
The Căian River is a right tributary of the river Mureș in Romania. It discharges into the Mureș in Păuliș. It starts at the confluence of headwaters Duba, Răcaș and Carpen.
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 Ciunga River is a left tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in Ocna Mureș.
The Boholt River is a right tributary of the river Mureș in Romania. It discharges into the Mureș in Șoimuș.
