The Comarca de Valle del Nalón is a region located in the province of Asturias, northern Spain. It is characterized by its rich industrial history, particularly in coal mining, which has shaped its economy and culture. The Nalón River runs through the comarca, providing a scenic landscape and opportunities for outdoor activities. The comarca includes several municipalities, such as Langreo, San Martín del Rey Aurelio, and Sotrondio. It is known for its natural beauty, with mountains and valleys that attract visitors. The area also features cultural heritage sites, reflecting its historical significance in the Asturias region.