High Quality Content by WIKIPEDIA articles! The Racovi a River or Valea River is a tributary of the Olt River in Romania. The Olt River is a river in Romania. It is the longest river flowing exclusively through Romania. Its source is in the H ma Mountains of the eastern Carpathian Mountains, near the village B lan. It flows through the Romanian counties Harghita, Covasna, Bra ov, 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. Sfântu Gheorghe, Râmnicu Vâlcea and Slatina are the main cities on the river Olt. The Olt flows into the Danube river near Turnu M gurele.