Derborence Valley Within Valais Mountain Range During Snowy Autumn In Valais, Switzerland

derborence valley diablerets mountain range mountainous valley hike conthey canton of valais switzerland valais nature alpine alps forest landscape swiss panorama snow nature reserve pine mountains summer trees reserve lake outdoor derborence glacier landschaft kanton wallis fall autumn conservancy basvalais fall colors schweiz season woods valais central rugged massive ridges trek conservation aerial