The Sierra de Gredos is a mountain range in central Spain that spans the provinces of Ávila, Salamanca, Cáceres, Madrid, and Toledo.

Its highest point is Pico Almanzor at 2,592 meters[1][2] and it has been declared a natural park by the Autonomous Community of Castile and León.

The Sierra de Gredos comprises mainly granite,[3] which is a common type of intrusive, felsic, igneous rock which is granular and phaneritic in texture.

During a large part of the Paleozoic Era, from 600 to 350 million years ago, the whole area was covered by the Tethys Ocean where horizontal layers or strata of sediments accumulated due to the process of erosion in the unflooded regions.

Erosion continued for a long time until between 40 and 2 million years ago, when another convulsion, known as the Alpine Orogeny, created the mountains that today comprise the Central System.