The Boundary Ranges , also known in the singular and as the Alaska Boundary Range , are the largest and most northerly subrange of the Coast Mountains . They begin at the Nass River , near the southern end of the Alaska Panhandle in the Canadian province of British Columbia and run to the Kelsall River , near the Chilkoot Pass , beyond which are the Alsek Ranges of the Saint Elias Mountains , and northwards into the Yukon Territory flanking the west side of the Yukon River drainage as far as Champagne Pass , north of which being the Yukon Ranges . To their east are the Skeena Mountains and Stikine Plateau of the Interior Mountains complex that lies northwest of the Interior Plateau ; the immediately adjoining subregion of the Stikine Plateau is the Tahltan Highland . To their northeast is the Tagish Highland , which is a subregion of the Yukon Plateau . Both highlands are considered in some descriptions as included in the Coast Mountains. The Alexander Archipelago lies offshore and is entirely within Alaska .
6-670: The Tagish Highland is an upland area on the inland side of the northernmost Boundary Ranges of the Coast Mountains , spanning far northwestern British Columbia from Atlin Lake to the area of the pass at Champagne, Yukon between the Alsek and Yukon Rivers . In some classification systems, and in local terminology, the Tagish Highland is considered to be part of the Boundary Ranges, as
12-777: A Yukon location is a stub . You can help Misplaced Pages by expanding it . Boundary Ranges The Boundary Ranges include several large icefields, including the Juneau Icefield , between the Alaskan city of the same name and Atlin Lake in B.C. ; and the Stikine Icecap , which lies between the lower Stikine River and the Whiting River . Some of the highest mountains in the Boundary Ranges are: Mount Ratz , 3,090 m (10,138 ft); Chutine Peak , 2,910 m (9,547 ft); and Devils Thumb , 2,766 m (9,075 ft), all in
18-726: Is notable as the location of the network of valleys leading inland from the Chilkoot and White Passes from the Yukon Ports of Skagway and Haines, Alaska to the headwaters of the Yukon River, downstream from which prospectors voyaged to the legendary goldfields of the Klondike Gold Rush . This article about a location in the Interior of British Columbia , Canada is a stub . You can help Misplaced Pages by expanding it . This article about
24-612: Is the neighbouring Tahltan Highland to its south. As classified by the Canadian Mountain Encyclopedia per S. Holland, the Tagish Highland is part of the system unofficially described as the Interior Mountains (also the Northern Interior Mountains). It is not as high or glacial as the neighbouring areas of the Boundary Ranges, but it is very rugged with extreme variations in relief. Historically it
30-491: The Stikine Icecap region; and Devils Paw , 2,593 m (8,507 ft), in the Juneau Icefield . (Other peaks in the Stikine Icecap are higher than 2,600 m (8,530 ft), but they have relatively low topographic prominence .) Despite the height of Mount Ratz and its neighbours, most of the Boundary Ranges are considerably lower than the Pacific Ranges of the southern Coast Mountains . The larger icefields of
36-484: The Boundary Ranges are at a much lower elevation than their southern counterparts in the Pacific Ranges because of the difference in latitude. Physiographically, they are a section of the larger Pacific Border province, which in turn is part of the larger Pacific Mountain System physiographic division. The granitic intrusions that form the Boundary Ranges are remnants of a Late Cretaceous volcanic arc system called
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