|Counties||Romania: Sălaj, Bihor
Hungary: Hajdú-Bihar, Békés
|- location||Plopiș Mountains, near Boghiș, Sălaj County, Romania|
|- location||near Szeghalom, Békés County, Hungary|
|Length||167 km (104 mi)|
|Basin||5,812 km2 (2,244 sq mi)|
|Progression||Crișul Repede→ Körös→ Tisza→ Danube→ Black Sea|
The Barcău or Bereteu (Romanian or Berettyó in Hungarian) is a river which has its origin in Sălaj County, Romania. It is about 167 kilometres (104 mi) long with a watershed area of 5,812 km2 (2,244 sq mi).:22 After crossing Bihor County in Romania and Hajdú-Bihar and Békés County in Hungary, it flows into the Sebes-Körös (Romanian: Crișul Repede) near Szeghalom.
The upper reach of the Barcău, upstream of the junction with the Răchita River is locally called the Ștei, Berchesei or Bărcașu. The reach between the junctions with the Răchita and the Toplița is locally known as the Tusa. The name Barcău is only used following its confluence with the Toplița.
Towns and villages
The following towns and villages are situated along the River Barcău, from source to mouth: in Romania Boghiş, Nuşfalău, Ip, Suplacu de Barcău, Balc, Abram, Marghita, Abrămuț, Chișlaz, Sălard, Tămășeu, in Hungary Kismarja, Pocsaj, Gáborján, Berettyóújfalu, Szeghalom.
The following rivers are tributaries to the River Barcău:
- Left: Răchita, Topliţa, Valea Iazului, Valea Mare, Groapa, Cerasa, Borumlaca, Săldăbagiu, Bistra, Valea Albă, Tria, Valea Fânețelor, Almaș, Valea Vițeilor, Fâneața Mare, Crișul Mic
- Right: Camăr, Curătura, Dijir, Inot, Cheț, Valea Lacului, Făncica, Sânnicolau, Ier
- Administrația Națională Apelor Române - Cadastrul Apelor - București
- Institutul de Meteorologie și Hidrologie - Rîurile României - București 1971
- Trasee turistice - județul Bihor 
- Trasee turistice județul Sălaj 
- Analysis of the Tisza River Basin 2007, IPCDR
- Ioan Abrudan, Aurel Medve - Ghidul ariilor naturale protejate din județul Sălaj - Editura Școala Noastră, Zalău, 2008 "Archived copy". Archived from the original on 2013-09-07. Retrieved 2013-07-04.
- Izvoarele Barcăului - Munții Șes Archived August 18, 2013, at the Wayback Machine.
- Harta interactivă - județul Sălaj 
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