The Alsek River is a wilderness river flowing from the Yukon into Northern British Columbia and into Alaska. The surrounding area from the Western edge of the Alsek to East of the East Alsek is known to locals as Dry Bay.
It starts at the confluence of the Dezadeash and Kaskawulsh rivers in Kluane National Park and Reserve. After flowing south into the northwestern tip of British Columbia, it is joined by the Tatshenshini River in Tatshenshini-Alsek Park. It reaches the Pacific Ocean at Dry Bay, in the Gulf of Alaska, south of Yakutat, Alaska close to the northern end of the Alaska Panhandle. Although the river is navigable by kayak or rubber raft in its northern reaches, it rapidly becomes unnavigable—for any but the most experienced and skilled kayakers—at Turnback Canyon.
On older maps, the Alsek river is labeled as the Tatshenshini and vice versa. Some Yukon First Nation elders also refer to the river as the Tatshenshini.