Trail Sierras Campiña Sur is a trail running series in the Sierra de Gredos, organized by Trail Sierras to promote off-road running in the region. It offers several race distances, allowing newer trail runners and more experienced mountain runners to choose a route fitting their level.
The courses traverse varied mountain terrain on well-marked trails, with aid stations provided. The organizers collaborate with local communities, ask runners to respect the natural environment, and conclude the day with local food and an awards ceremony.