Teleajen

{{Infobox river

| name = Teleajen

| native_name =

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| image = Teleajen_River.JPG

| image_size =

| image_caption = Teleajen near Ploiești

| pushpin_map = Romania

| subdivision_type1 = Country

| subdivision_name1 = Romania

| subdivision_type2 = Counties

| subdivision_name2 = Prahova County

| subdivision_type3 = Towns

| subdivision_name3 = Vălenii de Munte

| length = {{convert|122|km|abbr=on}}

| width_min =

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| source1 = Ciucaș Mountains near Cheia

| source1_location =

| source1_coordinates=

| source1_elevation = {{convert|1754|m|abbr=on}}

| mouth = Prahova

| mouth_location = near Palanca

| mouth_coordinates = {{coord|44|48|43|N|26|13|03|E|display=inline,title}}

| mouth_elevation =

| progression = {{RPrahova}}

| basin_size = {{convert|1656|km2|abbr=on}}

| tributaries_left =

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}}

The Teleajen is a left tributary of the river Prahova in southern Romania.{{GeoSource|RO|Annex7|861-862}}{{GeoSource|RO|Atlas|352-354|XI.1.20.13}} Its source is at {{convert|1754|m|abbr=on}} elevation in the Ciucaș Mountains, north of Roșu Peak and the locality of Cheia. Upstream from its confluence with the Gropșoarele in Cheia, it is also called Berea or Cheița.{{cite journal|url=https://www.limnology.ro/water2014/proceedings/18_Lidia_Salajan.pdf|title=The analysis of the flash floods occurred in the upper basin of the Teleajen river|author1=Salajan, L.|author2=Găină, A.|author3=Apostol, A.|work=2nd International Conference Water resources and wetlands. 11–13 September 2014 Tulcea|year=2014|pages=140–141}} 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.[http://www.e-calauza.ro/index.php?afiseaza=pluta_noua&rau=443 Teleajen (jud. Prahova)], e-calauza.ro Its length is {{convert|122|km|abbr=on}} and its basin size is {{convert|1656|km2|abbr=on}}.{{GeoSource|RO|Atlas|352-354|XI.1.20.13}}