The Guadarrama is a river in Spain. A tributary of the Tagus, the longest river on the Iberian Peninsula, Guadarrama has its source in the Siete Picos, part of the Sierra de Guadarrama, in the Community of Madrid, in the central part of the country, at an altitude of 1,900 metres.
The Guadarrama flows from north to south for 131.80 kilometres through the autonomous community of Castilla-La Mancha and the Province of Toledo, where it empties into the Tagus.
