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 average discharge at the mouth is 174 m3/s (6,100 cu ft/s). Its source is in the Hășmaș Mountains of the eastern Carpathian Mountains, near Bălan, rising close to the headwaters of the river Mureș. 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.
The Karaš or Caraș is a 110-kilometre (68 mi) long river in the Banat region of Vojvodina, Serbia and Romania and a left tributary of the Danube. The Karaš drains an area of 1,400 square kilometres (540 sq mi) and although it has been channeled it is not navigable.
The Bârlad is a river in eastern Romania, a left tributary of the river Siret. Its total length is 207 km (129 mi), and its drainage basin area is 7,220 km2 (2,790 sq mi). Its source is in the low hills between the Siret and Prut rivers, southwest of Iași. It flows generally south, through the cities of Negrești, Vaslui, Bârlad and Tecuci. The Bârlad flows through the Romanian counties of Neamț, Vaslui and Galați. It flows into the Siret near Suraia.
The Arieșul Mic is a river in the Apuseni Mountains, Alba County, western Romania. It is the right headwater of the river Arieș. It flows through the villages Avram Iancu and Vidra, and joins the Arieșul Mare in Mihoești near Câmpeni. Its length is 34 km (21 mi) and its basin size is 160 km2 (62 sq mi).
The Valea Lungă is a right tributary of the river Ilișua in Romania. It flows into the Ilișua in Târlișua. Its length is 17 km (11 mi) and its basin size is 81 km2 (31 sq mi).
The Rosua is a right tributary of the river Șieu in Romania. It discharges into the Șieu in Șintereag. Its length is 21 km (13 mi) and its basin size is 138 km2 (53 sq mi). Its tributaries are Valea Aurului, Valea Lungă and Valea Blăjenilor, all from the left.
The Drăgan is a left tributary of the river Crișul Repede in Romania. It discharges into the Crișul Repede near Valea Drăganului. Its length is 42 km (26 mi) and its basin size is 254 km2 (98 sq mi).
The Bistra is a river in south-western Romania, in the Banat. It is a right tributary of the river Timiș. Its valley delimits the Țarcu Mountains to the south from the Poiana Ruscă mountains to the north. Its name is derived from a Slavic word meaning "fast-flowing".
The Bistrița is a right tributary of the river Tismana in Romania. It discharges into the Tismana near Șomănești. Its source is in the Vâlcan Mountains. Its length is 45 km (28 mi) and its basin size is 274 km2 (106 sq mi).
The Cricovul Dulce or Cricov is a left tributary of the river Ialomița in Romania. It discharges into the Ialomița near Podu Văleni. It flows through the towns and villages Valea Lungă-Cricov, Iedera de Jos, Moreni, Ion Luca Caragiale, Vlădeni, Băltița, Hăbud and Crivățu. Its length is 80 km (50 mi) and its basin size is 579 km2 (224 sq mi). Part of the water from the river Prahova is diverted towards the Cricovul Dulce by the canal Iazul Morilor Prahova.
The Valea Lungă is a right tributary of the river Târnava Mare in Romania. It flows into the Târnava Mare in the village Valea Lungă. Its length is 14 km (8.7 mi) and its basin size is 35 km2 (14 sq mi).
The Cheia is a right tributary of the river Olănești in Romania. It flows into the Olănești in Valea Cheii. Its length is 25 km (16 mi) and its basin size is 80 km2 (31 sq mi).
The Bistra Mărului is a left tributary of the river Bistra in Romania. It discharges into the Bistra in Oțelu Roșu. Its length is 35 km (22 mi) and its basin size is 293 km2 (113 sq mi).
The Turcu is a right tributary of the river Bârsa in Romania. It discharges into the Bârsa in Tohanu Vechi near Zărnești. Its source is in the Bucegi Mountains. Its length is 30 km (19 mi) and its basin size is 201 km2 (78 sq mi).
The Chirița is a left tributary of the river Bahlui in eastern Romania. It flows into the Bahlui in Dancu. Its length is 15 km (9.3 mi) and its basin size is 39 km2 (15 sq mi).
The Șușara is a left tributary of the river Nera in Romania. It discharges into the Nera in Sasca Montană. Its length is 8 km (5.0 mi) and its basin size is 15 km2 (5.8 sq mi).
The Bolvașnița is a right tributary of the river Timiș in Romania. It discharges into the Timiș in Valea Timișului. Its length is 18 km (11 mi) and its basin size is 59 km2 (23 sq mi).
The Berzasca is a left tributary of the river Danube in Romania. It discharges into the Danube in the village Berzasca. Its length is 46 km (29 mi) and its basin size is 229 km2 (88 sq mi).
The Lechința or Comlod is a right tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in the village Lechința, near Iernut. Its length is 66 km (41 mi) and its basin size is 537 km2 (207 sq mi). Its Hungarian name is from the “komló” for hops, so its name means “Hops Creek”.
The Târnava Mare is a river in Romania. Its total length is 223 km (139 mi) and its basin size is 3,666 km2 (1,415 sq mi). Its source is in the Eastern Carpathian Mountains, near the sources of the Mureș and Olt in Harghita County. It flows through the Romanian counties of Harghita, Mureș, Sibiu, and Alba. The cities of Odorheiu Secuiesc, Sighișoara, and Mediaș lie on the Târnava Mare. It joins the Târnava Mică in Blaj, forming the Târnava.
