Aerial flyover over the shores and water of Lac de Salanfe in Valais, Switzerland on a sunny autumn day in the Swiss Alps with a view of alpine peaks, cliffs and hydroelectric dam

valais autumn switzerland alps mountains hiking trees drone nature lake landscape salanfe aerial hike colorful larches forest island dam october alpine swiss europe travel construction road wall environment adventure 4k tourism outdoors natural fly hiker view panorama sunlit sunshine sunny evionnaz fall cliff concrete climate change energy hydroelectric renewable reservoir