Peyto Lake in Banff National Park in the Canadian Rockies, as seen from the Bow Summit Lookout.
Please see my full gallery with more nature and wildlife photos from the Canadian Rockies here.
Shot with Nikon D70 and Nikkor 18-70mm f/3.5-4.5 lens; Cokin ND Gray Filter attached. Edited in Lightroom 5.7.