The Olt is a river in Romania. It is 615 km (382 mi) long, and its basin area is 24,050 km2 (9,290 sq mi). It is the longest river flowing exclusively through Romania. Its source is in the Hășmaș Mountains of the eastern Carpathian Mountains, near Bălan, rising close to the headwaters of the Mureș River. It flows through the Romanian counties Harghita, Covasna, Brașov, Sibiu, Vâlcea and Olt. The river was known as Alutus or Aluta in Roman antiquity. Olt County and the historical province of Oltenia are named after the river.
Bistrița is a left tributary of the river Olt in Romania. It discharges into the Olt near Băbeni. It starts in the Căpățânii Mountains forming one of the narrowest gorges in Romania and some beautiful caves. It flows through the villages Bistrița, Costești, Bălțățeni, Tomșani, Foleștii de Jos and Frâncești.
The Arcuș River is a right tributary of the river Olt in Romania. It discharges into the Olt near Sfântu Gheorghe. It starts at the confluence of headwaters Pârâul Mare and Pârâul Umbros.
The Arpaș River is a left tributary of the river Olt in Romania. It discharges into the Olt in Arpașu de Jos. It starts at the confluence of two headwaters Arpașul Mare and Podragu
The Govora River is a right tributary of the river Olt in Romania. It discharges into the Olt near Mihăești.
The Iminog River is a left tributary of the river Olt in Romania. It discharges into the Olt in Mărunței.
The Baciu is a right tributary of the river Olt in Romania. It discharges into the Olt in Dobolii de Jos.
The Lotrioara River is a right tributary of the river Olt in Romania. It discharges into the Olt in Lazaret. It is starts at the confluence of two branches: Valea Ursului and Sterpu
The Olănești River is a right tributary of the river Olt in Romania. It discharges into the Olt in Râmnicu Vâlcea.
The Redea River or Pârliți River or Valea Redea River is a tributary of the Vlădila River in Romania.
The Racovița River or Valea River is a tributary of the Olt River in Romania.
The Băiașu River is a left tributary of the river Olt in Romania. It discharges into the Olt in Copăceni.
The Pesceana River is a right tributary of the river Olt in Romania. It discharges into the Olt in Drăgășani.
The Dorofei River or Șerbănești River is a right tributary of the river Vedea in Romania. It discharges into the Vedea in Nicolae Titulescu.
The Homorod River is a tributary of the Olt River in Romania. It is formed at the confluence of the headwaters of Homorodul Mare and Homorodul Mic, in the village Homorod. It discharges into the Olt in Ungra.
The Teslui River is a right tributary of the river Olt in Romania. It discharges into the Olt in Fărcașele.
The Beica River is a tributary of the river Olt in Romania. It joins the Olt through the Oporelu Canal.
The Surdui River is a tributary of the Olt River in Romania.
The Strehareți River is a tributary of the Olt River in Romania, near the city of Slatina.
The Suhatul River or Studina River is a tributary of the Olt River in Romania.
