La Barranca (valley)
La Barranca valley is a mountain valley located at the foothills of Bola del Mundo (Alto de Guarramillas) (2265 m) and La Maliciosa (2227 m), within the Sierra de Guadarrama (a mountain range part of the Sistema Central). Administratively, it lies within the municipal boundaries of Navacerrada and Becerril de la Sierra, in the northwest of the Community of Madrid, Spain. The valley is home to a dense forest of Scots pine through which flows a mountain river, the Samburiel —a tributary of the Manzanares river—held back by two small dams, the Pueblo de Navacerrada Dam and the Air Force Dam, before emptying into the Navacerrada Dam.