The summit of the Peña de Francia Nature · El Cabaco, Sierra de Francia, Salamanca At 1,727 metres, it is one of the highest peaks in the sierra and belongs to this municipality. Its perched syncline is formed of Ordovician quartzites in which marine fossils appear, chiefly Cruziana trace fossils of trilobites and worm burrows. From its summit, occupied by the sanctuary of Nuestra Señora de la Peña de Francia, one can see the Campo Charro plain to the north, the Sierra de Tamames to the east, and the Gabriel y Galán reservoir to the south. Photo: Sotos (Wikimedia Commons) (CC0) What to see and do in El Cabaco