Manzanares (river) it flows near the dormitory town of Arganda del Rey, ending its journey. The river Manzanares, although small and relatively unimportant geographically, has had a great historical importance due to its close relation to the city of Madrid. The city was founded by the Moors as a citadel overlooking the river in the ninth century. The river is also featured in many paintings of the late 18th to early 19th-century painter Francisco de Goya, which show traditionally dressed "Madrileños" in activities like dancing or having picnics next to the river. The Manzanares was also an important defence line for the
Soto del Real it is protected inside the Parque Regional de la Cuenca Alta del Manzanares. It borders with Manzanares el Real on the West, Miraflores de la Sierra on the East, Colmenar Viejo on the South, and Rascafría on the North. Soto del Real encompasses a variety of terrains: mountain tops, slopes, and the Manzanares-Guadalix tectonic pit. The urban nucleus is inside the pit, going through the Mediano, Chozas and Matarrubias streams, which flow into the Santillana reservoir, so they are tributaries of the Manzanares river. Geologically speaking, it is divided into the Mountain range, where there is a predominance of Gneiss