The bouldering area of Valle del Nalón in Asturias, encompassing the sectors of Cucuruxu, La Rebollada, and Anzó, is distinguished by its predominantly high grades, making it less recommended for beginners. With a limited number of problems in each sector, climbers can anticipate a more specialized and focused experience. The limestone rock type adds to the unique charm of the area, providing seasoned boulderers with challenging and technical routes amid the scenic landscapes of Asturias.