The Jiu (; ; ; ) is a river in southern Romania. It is formed near PetroÃÂani by the confluence of headwaters Jiul de Vest and Jiul de Est.
It flows southward through the Romanian counties Hunedoara, Gorj, and Dolj before flowing into the Danube near ZÃÂval, a few kilometers upstream from the Bulgarian city of Oryahovo. It is long, including its source river, Jiul de Vest. It has a basin of . Its average discharge at the mouth is .
The upper Jiu Valley, around PetroÃÂani and Lupeni, is Romania's principal coal mining region.
The following towns are situated along the Jiu, from source to mouth: PetroÃÂani (Jiul de Est), Lupeni (Jiul de Vest), BumbeÃÂti-Jiu, Târgu Jiu, Turceni, FiliaÃÂi, and Craiova.
The following rivers are tributaries of the Jiu (from source to mouth):