Explore hiking trails around San Martín y Mudrián, Castilla y León. The best hike near San Martín y Mudrián is Collado de Cerromalejo Loop via Pista forestal de la Calle Alta, a 6.0 mile loop in Parque Natural de la Sierra de Guadarrama Norte. San Martín y Mudrián has population 250.0.