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 (6,200 ft).

You can help expand this article with text translated from the corresponding article in Spanish. (June 2014) Click [show] for important translation instructions. View a machine-translated version of the Spanish article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 5,030 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Spanish Wikipedia article at [[:es:Río Guadarrama]]; see its history for attribution. You should also add the template {{Translated|es|Río Guadarrama}} to the talk page. For more guidance, see Wikipedia:Translation.

You can help expand this article with text translated from the corresponding article in Italian. (June 2014) Click [show] for important translation instructions. View a machine-translated version of the Italian article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 3,075 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Italian Wikipedia article at [[:it:Guadarrama (fiume)]]; see its history for attribution. You should also add the template {{Translated|it|Guadarrama (fiume)}} to the talk page. For more guidance, see Wikipedia:Translation.

Quick Facts Location, Country ...

Guadarrama
Río Guadarrama. Community of Madrid, Spain
Path of the Guadarrama
Location
Country	Spain
Region	Community of Madrid Castilla-La Mancha Province of Toledo
Physical characteristics
Source
• location	Siete Picos (Sierra de Guadarrama)
• elevation	1,900 m (6,200 ft)
Mouth
• location	Tagus
• elevation	500 m (1,600 ft)
Length	131.80 km (81.90 mi)
Basin size	1,708 km2 (659 sq mi)
Basin features
Progression	Tagus→ Atlantic Ocean
Tributaries
• left	Aulencia

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The Guadarrama flows from north to south for 131.80 kilometres (81.90 mi) through the autonomous community of Castilla-La Mancha and the Province of Toledo, where it empties into the Tagus.

Its middle course is a protected area within the Regional Park of the Middle Course of the Guadarrama River and Its Surroundings (Spanish: Parque Regional del curso medio del río Guadarrama y su entorno), which is one of the three regional parks within the Community of Madrid.^[1] The basin area is about 1,708 square kilometres (659 sq mi) Its main tributary is the Aulencia River, which flows entirely within the Community of Madrid and supplies water to the reservoir of Valmayor.