Right around the middle is the edge of a frozen lake and as you draw your eye down to the lower section that's all frozen lake, the background is standard mountains, the lower foreground is a rocky mouth of a super slow flowing river (why it hasn't frozen because it's moving) and a great reflection of the distant mountains.

I miss BC/AB so much. This postcard level stuff is just day to day up there. Amazing place, particularly in the winter. Great photo.