Genaro Trail GR-300 Activity · Cervera de Buitrago, Sierra Norte, Madrid Image of Cervera de Buitrago, not of the place itself. The first long-distance footpath in the Region of Madrid: a seventy-kilometre circuit in seven stages around the El Atazar reservoir, linking El Berrueco, Patones de Arriba, El Atazar, Robledillo de la Jara, Cervera de Buitrago and Mangirón. Photo: Malopez 21 (CC BY-SA 4.0) What to see and do in Cervera de Buitrago