natural tunnel on hiking trail path route senda del cares valley canyon in picos de europa mountains leon asturias spain

adventure asturias beautiful cain cantabrian canyon cares collaos del divina europa europe garganta gorge green hiking hole landscape leon los mountain mountains narrow natural nature outdoor panorama path peak picos poncebos posada range ravine recreation river rock ruta senda spain sport stone the tourism track trail travel traveler trekking tunnel valdeon valley walking