artificial reservoir lake lago di lucendro or accumulation lake lucendro in the swiss alpine area of the st. gotthard pass

accumulation adventure airolo alpine alps architecture area artificial attraction blue canton canyon clear concrete construction descending dry electricity energy gotthard gotthardpass green hiking hill hydroelectric hydropower impact lago lake landscape lucendro mountain mountains nature outdoor outdoors panorama pass peaks plant power reservoir river scene scenery scenic schweiz sky spring strong structure summer swiss switzerland tessin thick ticino top tourism tourist tourists travel trees vacation valley view wall water