artificial lake gigerwaldsee or reservoir gigerwald lake and the calfeisental valley in the unesco world heritage tectonic arena

alpine alps amazing arena artificial background beautiful blue calfeisental canton destination eco ecology europe european flower forest gallen gigerwald gigerwaldsee grass green heritage high idyllic lake landscape meadow mountain mountains natural nature old outdoor outdoors panorama panoramic peaceful peak picturesque reservoir rock sardona scene scenery scenic schweiz season sky spring summer swiss switzerland tectonic travel tree trekking unesco valley view water wild wonderful world