Situated in the piedmont area between Dronero and Busca, this Nature Reserve protects an extraordinary geological phenomenon: the erosion columns. The so-called "stone mushrooms" derive from the selective erosion of a single side, and can be found here in considerable quantities and characterized by different sizes. The itinerary across this "rocky garden" can be carried out along the Equipped Trails, while at the entrance of the Reserve the Visitor Center will welcome you with the related services, picnic areas, and its sport, tourist, and hiking trails. The Reserve is open during the whole year.