the dam gigerwald or concrete dam on the reservoir lake gigerwaldsee gigerwald lake in the unesco world heritage tectonic arena

adventure alps architecture arena attraction blue canyon clear concrete construction dam descending dry electricity energy gigerwald gigerwaldsee green heritage hiking hill hydroelectric hydropower impact lake landscape mountain mountains nature outdoor outdoors panorama peaks plant power reservoir river sardona scene scenery scenic sky spring strong structure summer switzerland tectonic tektonikarena thick top tourism tourist tourists travel trees unesco unescowelterbe vacation valley view wall water world