Stock Photo - Collado de la Dehesilla in the Regional Park of La Pedriza. Sierra de Guadarrama. Madrid. The Regional Park of La Pedriza is located in the Sierra de Guadarrama in the province of Madrid. The Park has numerous recreational activities, such as hiking, biking and horseback riding, and excursions to observe fauna and flora. The Collado de la Dehesilla is one of the most emblematic viewpoints of the Regional Park of La Pedriza. This large rock platform formed by wind and water erosion is located at an altitude of 2,150 meters, offering a panoramic view of the magnificent nature that surrounds the park. The Collado de la Dehesilla is also an ideal starting point for hiking, mountain biking and cross-country skiing during the winter months.