Voltoya River Voltoya River The Voltoya is a river in Spain. It is a tributary river of Eresma River which is, in turn a tributary of the Adaja River that emerges from Douro River. Its starts in the mountains of Guadarrama and Malagón. The water from Dehesa de la Cepeda , enclave of the city of Madrid and the Azálvaro Field also flow into the Voltoya . It runs through the Castilian-Leonese provinces of Ávila and Segovia . Its mouth is in Coca (Segovia). The Serones Reservoir, which supplies drinking water to the city of Ávila is located on the Voltoya. Tributaries
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