Lake Sils in Switzerland Upper Engadine valley, Grisons Swiss nature aerial

lake sils switzerland upper engadine valley grisons swiss nature aerial scenery landscape view environment water region mountains reflection travel geography altitude wilderness tranquility panorama beauty outdoors highland meadow lakeside adventure exploration photography terrain natural lake sils upper engadine engadine valley grisons region swiss nature aerial view nature scenery alpine lake valley landscape swiss lakes scenic lake nature photography high altitude mountain valley