The view, on a clear day, is of the Columbia Icefield 75km to the south.

BBC: The natural wonders of Banff and Jasper National Parks

It's the cue for effusive guide Fridjon Thorleifsson to introduce the surrounding Columbia Icefield, a 77-square-mile web of six silvery tentacles between Jasper and Banff, and the largest ice cap south of the Arctic Circle.

BBC: The perfect trip: The Canadian Rockies