Aerial flyover over the longest glacier in the Alps - the Aletsch glacier in Valais, Switzerland - with view of the sunset at the end of the glacier

aletsch aletschgletscher glacier gletscher fiescheralp riederalp glaciers moraine glacial alps mountains landscape wallis valais mountain crevasses crevasse alpine environment ice jungfrau swiss alps frozen suisse hike hiking cold swiss altitude nature adventure climate change switzerland schweiz sunrise europe dusk aerial cloudy clouds wanderlust sunset drone longest flyover climbing summer bettmeralp