Lake McDonald is the largest lake in Glacier National Park. In winter it partly freezes, and at sunset the peaks above it catch a warm alpenglow while the water stays a deep cold blue.

Alpenglow is the reddish light seen on mountains when the sun is low or just below the horizon, caused by light scattered through a long path of atmosphere.

Photo by David Restivo, published by Glacier National Park under the Creative Commons Attribution 2.0 licence.

Credit and licence

Creator
David Restivo, U.S. National Park Service (GlacierNPS)
Licence
CC BY 2.0
Terms
Attribution required; changes must be indicated (resized and recompressed for the app). Commercial use and redistribution permitted.
Source
Wikimedia Commons
Credit line
“Alpenglow on Lake McDonald” by David Restivo, U.S. National Park Service (GlacierNPS) (CC BY 2.0), via Wikimedia Commons