 It covers a rough rectangle of 7.68 square kilometers.The coordinates of the reserve's central zone are 40° 50′ N 3° 57′ W.

In the northern zone are two projecting cliffs difficult to reach; the northernmost is Bird Cliff, with a height of 2.334 kilometers.Close by and to the south is the Cliff of Carnations, which being 2.388 kilometers above sea level is the second-highest peak in the Sierra de Guadarrama.