Muslim Walls of Madrid Muslim Walls of Madrid The Muslim Walls of Madrid, also known as theArab Walls of Madrid, of which some vestiges remain, are located in the Spanish city of Madrid. They are probably the oldest construction extant in the city. They were built in the 9th century, during the Muslim domination of the Iberian Peninsula, on a promontory next to Manzanares river. They were part of a fortress around which developed the urban nucleus of Madrid. They were declared an Artistic-Historic Monument in 1954. The remains of utmost importance, with more archaeological than artistic interest, are in the Cuesta de la
Guadarrama (river) (), which is one of the three regional parks within the Community of Madrid. The basin area is about Its main tributary is the Aulencia River, which flows entirely within the Community of Madrid and supplies water to the reservoir of Valmayor. Guadarrama (river) 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 . The Guadarrama flows from north to