The Valle del Lozoya is the most extensive valley of the Sierra de Guadarrama range and one of the best conserved. It is located entirely within the Community of Madrid, between the Cuerda Larga and the main alignment of the mountain system, running in a southwest to northeast direction, and located, with respect the range as a whole, at its northeast stretch. The valley is more than 25 km in length and 6 km in average width. The slopes of the valley are covered with wild pine, oak and chestnut forests. By contrast, the lower valley area is dominated by grass pastures and farm crops. In the heart of the valley are two towns: Rascafría and Lozoya, both of which lend their names to the two rivers that run through the valley. (Taken from Wikipedia)
The pictures were taken yesterday near Pinilla de Buitrago.