Bihor County is a county (județ) in western Romania. With a total area of 7,544 km2 (2,913 sq mi), Bihor is Romania’s 6th largest county geographically and the main county in the historical region of Crișana. Its capital city is Oradea.
The Crișul Repede is a river in Bihor County, Crișana, Romania and in southeastern Hungary (Körösvidek). Together with the rivers Crișul Alb and Crișul Negru, it makes up the Three Criș rivers. These are considered the main rivers in the Crișana region of Romania. Historically, when Crișana was recognised as an official region, the Criș rivers were the most important in the region. Its basin size is 9,119 km2 (3,521 sq mi). Its length in Romania is 171 km (106 mi).
The Arieș is a left tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in Gura Arieșului, 11 km (6.8 mi) southwest of Luduș. Its total length is 166 km (103 mi), and its drainage basin area is 3,005 km2 (1,160 sq mi).
The Valea Roșie or Roșia is a river in Romania, Bihor County, right tributary of the Crișul Negru. Its length is 38 km (24 mi) and its basin size is 308 km2 (119 sq mi).
The Meziad is a river in Bihor County, western Romania. It is a left tributary of the river Valea Roșie. It flows into the Valea Roșie in Remetea. Its length is 19 km (12 mi) and its basin size is 61 km2 (24 sq mi).
The Șoimuș is a left tributary of the river Valea Roșie in Romania. It flows into the Valea Roșie near Roșia. Its length is 17 km (11 mi) and its basin size is 43 km2 (17 sq mi).
The Valea Mare is a left tributary of the river Crișul Negru in Romania. It flows into the Crișul Negru near Cusuiuș. Its length is 8.9 km (5.5 mi) and its basin size is 21.7 km2 (8.4 sq mi).
The Brătcuța is a left tributary of the river Crișul Repede in Romania. It discharges into the Crișul Repede near Bratca. Its length is 14 km (8.7 mi) and its basin size is 37 km2 (14 sq mi).
The Moneasa is a river in Bihor County and Arad County, Romania. At its confluence with the river Dezna in the village Dezna, the river Sebiș is formed. Its length is 19 km (12 mi) and its basin size is 81 km2 (31 sq mi).
The Iad is a left tributary of the river Crișul Repede in Romania. It discharges into the Crișul Repede near Bulz. Its length is 46 km (29 mi) and its basin size is 220 km2 (85 sq mi).
The Dobrinești is a left tributary of the river Crișul Repede in Romania. The river rises in the Izbucul Gălășeni, located on the northern part of the Ciungilor Plateau of the Pădurea Craiului Mountains. It discharges into the Crișul Repede near Aușeu. Its length is 11 km (6.8 mi) and its basin size is 47 km2 (18 sq mi).
The Topa is a right tributary of the river Holod in Romania. It flows into the Holod near Copăceni. Its length is 38 km (24 mi) and its basin size is 276 km2 (107 sq mi).
The Corhana is a river in western Romania and eastern Hungary, a tributary of the Crișul Repede. Its source is 2 km south of the village Șauaieu. It flows in western direction towards Cefa, where much of its flow is diverted by the Criș Collector Canal towards the Crișul Negru near Tămașda. Part of its flow continues west and crosses the Hungarian border between Marțihaz and Geszt. The river is diverted into the canals of the drainage system of the area. The meanders of the Korhány near Geszt are a Natura 2000 site.
The Valea Nesecată is a left tributary of the river Gepiu in Romania. It flows into the Gepiu near the village Gepiu.
The Valea Fânețelor is a left tributary of the river Barcău in Romania. It discharges into the Barcău near Cenaloș. It flows through the villages Cuieșd, Țigăneștii de Criș, Picleu, Brusturi, Păulești, Gurbești, Spinuș, Ciulești and Sărsig. Its length is 30 km (19 mi) and its basin size is 178 km2 (69 sq mi).
The Făncica is a right tributary of the river Barcău in Romania. It discharges into the Barcău near the village Făncica. Its length is 25 km (16 mi) and its basin size is 100 km2 (39 sq mi).
The Bistra is a left tributary of the river Barcău in Romania. It discharges into the Barcău near Marghita. It flows through the villages Șinteu, Voivozi, Popești, Bistra, Ciutelec, Bogei, Tăuteu, Poiana and Chiribiș. Its length is 47 km (29 mi) and its basin size is 175 km2 (68 sq mi).
The Izvor is a right tributary of the river Crișul Repede in Romania. It flows into the Crișul Repede near Aleșd. Its length is 12 km (7.5 mi) and its basin size is 56 km2 (22 sq mi).
The Dijir is a right tributary of the river Barcău in Romania. It discharges into the Barcău near Marghita. Its length is 15 km (9.3 mi) and its basin size is 31 km2 (12 sq mi).
The Corbeni is a right tributary of the river Valea Fânețelor in Romania. It flows into the Valea Fânețelor near Săliște. Its length is 14 km (8.7 mi) and its basin size is 22 km2 (8.5 sq mi).
