waterfalls on alpine stream tellerbach in the calfeisental valley and in the unesco world heritage tectonic arena sardona

adventure alpine arena beautiful blue calfeisental canyon canyoning cascade cascades cliff creek ecology environment extreme fall flow flowing foliage forest green heritage high hiking landscape leaves moss mountain mountains natural nature outdoor outdoors peak river rock sardona scenery scenic schweiz speed stone stream summer swiss switzerland tectonic tektonikarena tellerbach tourism travel tree trekking unesco unescowelterbe valley view wanderlust water waterfalls wild wilderness world