At the Diablo Lake Overlook, along Washington State Highway 20 (North Cascades Highway), Mountain Shadows.  It is late afternoon.

But when you zoom out a little…  Shadows disappear.

And you see the blue-green glacial waters of Diablo Lake, behind Diablo Dam, on the Skagit River.

https://dailypost.wordpress.com/photo-challenges/shadow-2017/