Banff National Park, Canada. A string of cerulean-hued glacial lakes provide sublime paddling beneath soaring glacier-draped mountains along the 200-km length of the Icefields Parkway here in Banff National Park. The Canadian Rockies reach their most dramatic proportions along this road between the towns of Lake Louise and Jasper. The valleys were filled with enormous glaciers at the maximum extent of the ice sheets at the height of the Pleistocene Epoch about 20,000 years ago. As these ice sheets melted, they left in their wake a string of glistening lakes all along this valley.