[1] Some of the towns of the comarca have been officially declared Conjunto Histórico-Artístico owing to their cultural and architectural value.

Its forested mountain slopes (alder, oak, pine and ash) rise over the Northern Castilian Plateau, marking the geographical limit of its southwestern plains (Llanura Salmantina).

From its southern side this mountain chain marks the northern limit of Las Hurdes, the Extremaduran comarca.

At the top of the Peña de Francia (1723 m) stands one of the highest Virgin Mary shrines of the world, as well as a RTVE antenna.

Among the rivers that cut valleys in the sierra, the most famous is the Río Francia, which gives the mountain chain its name, as well as the Alagón.