The Cega is a river in the

Iberian Peninsula The Iberian Peninsula (), ** * Aragonese and Occitan: ''Peninsula Iberica'' ** ** * french: Péninsule Ibérique * mwl, Península Eibérica * eu, Iberiar penintsula also known as Iberia, is a peninsula in southwestern Europe, defi ...

a left-bank tributary of the

Douro The Douro (, , ; es, Duero ; la, Durius) is the highest-flow river of the Iberian Peninsula. It rises near Duruelo de la Sierra in Soria Province, central Spain, meanders south briefly then flows generally west through the north-west part o ...

. It is born out of the confluence of the Artiñuelo and the Vueltas creeks in the

Sierra de Guadarrama The Sierra de Guadarrama (Guadarrama Mountains) is a mountain range forming the main eastern section of the Sistema Central, the system of mountain ranges along the centre of the Iberian Peninsula. It is located between the systems Sierra de Gr ...

. 133 km-long, the Cega, running northwest through the

province of Segovia Segovia () is a province of central/northern Spain, in the southern part of the autonomous community of Castile and León. It is bordered by the province of Burgos in the north, Soria in the northeast, Guadalajara in the east, Madrid in the south, ...

, empties in the Douro in the

province of Valladolid Valladolid () is a province of northwest Spain, in the central part of the autonomous community of Castile and León. It has a population of 520,716 people in a total of 225 municipalities, an area of and a population density of 64.19 people per ...

, having previously received the waters of the Pirón, its main left-bank tributary.

References

Tributaries of the Douro River Rivers of Castile and León Geography of the Province of Segovia Rivers of Valladolid Sierra de Guadarrama {{Spain-river-stub