cavallers reservoir surrounded by high mountains reflected in the water, river noguera de tor in ribagorza, boí valley, in the

alpine artificial blue boashy canyon catalonia cavallers climbing cloudy cold concrete dam green high hike lake landscape lerida lleida mountain mountainous national natural nature nobody outdoors panorama park peaceful peak pyrenees reflected reflection reflex reservoir resource ribagorza river scenery serenity spain spanish summer taull trail travel trek trekking vacation water