The Cega is a river in the

Iberian Peninsula The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, comprisin ...

a left-bank tributary of the

Douro The Douro (, , , ; ; ) is the largest river of the Iberian Peninsula by discharge. It rises near Duruelo de la Sierra in the Spanish Soria Province, province of Soria, meanders briefly south, then flows generally west through the northern par ...

. 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 in Spain, between the systems Sierra de ...

. 133 km-long, the Cega, running northwest through the province of Segovia, 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 525,398 across a total of 225 municipalities, an area of , meaning a population density of 64.77 people ...

, 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