Alsek River, British Columbia, Canada. Truly one of the great river trips in the Western Hemisphere, the mighty Alsek River forms from glacial runoff in the Yukon Territory of Canada near the town of Haines Junction. For over 125 miles, the river flows through deep valleys in the heavily-glaciated mountains of the Saint Elias Range in Canada’s Yukon Territory and British Columbia before the waters of the Tatshenshini River combine with its flow upstream of Glacier Bay National Park in Alaska. Along the way, the river pauses in iceberg-studded Lowell Lake and Alsek Lake before draining into Dry Bay in the Gulf of Alaska. This image was made several miles below notorious Turnback Canyon as a fleeting shaft of light turned the surface of the river a silvery pewter.