"131800.0"^^ . "1900.0"^^ . . "1.708e+09"^^ . . "Guadarrama"@en . "500.0"^^ . . . "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 Peak, 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)."@en .