The Teleajen is a left tributary of the river Prahova in southern Romania. Its source is at 1,754 m (5,755 ft) elevation in the Ciucaș Mountains, north of and the locality of Cheia. Upstream from its confluence with the Gropșoarele in Cheia, it is also called Berea or Cheița. It flows through the Cheia hollow, by the towns of Vălenii de Munte and Boldești-Scăeni and the city of Ploiești. It discharges into the Prahova near Palanca. Its length is 122 km (76 mi) and its basin size is 1,656 km2 (639 sq mi).