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The Boundary Ranges, also known in the singular and as the Alaska Boundary Range, are the largest and most northerly subrange of the Coast Mountainsmarker. They begin at the Nass River, near the southern end of the Alaska Panhandlemarker in the Canadian province of British Columbiamarker and run to the Kelsall Rivermarker, near the Chilkoot Passmarker, beyond which is the Alsek Ranges of the Saint Elias Mountainsmarker, and northwards into the Yukon Territorymarker flanking the west side of the Yukon Rivermarker drainage as far as Champagne Passmarker, north of which being the Yukon Ranges. To their east are the Skeena Mountains and Stikine Plateaumarker of the Interior Mountains complex that lies northwest of the Interior Plateaumarker; the immediately adjoining subregion of the Stikine Plateau is the Tahltan Highlandmarker. To their northeast is the Tagish Highland, which is a subregion of the Yukon Plateaumarker. Both highlands are considered in some descriptions as included in the Coast Mountains. The Alexander Archipelagomarker lies offshore and is entirely within Alaskamarker.

The Boundary Ranges include several large icefields, including the Juneau Icefieldmarker, between the Alaskamarker city of the same name and Atlin Lakemarker in B.C.marker; and the Stikine Icecapmarker, which lies between the lower Stikine Rivermarker and the Whiting Rivermarker. Some of the highest mountains in the Boundary Ranges are: Mount Ratzmarker, 3090 m (10138 ft), Chutine Peakmarker, 2910 m (9547 ft), and Devils Thumbmarker, 2766 m (9077 ft), all in the Stikine Icecapmarker region; and Devils Pawmarker, 2593 m (8507 ft), in the Juneau Icefieldmarker. (There are other peaks in the Stikine Icecapmarker higher than 2600 m but they have relatively low topographic prominence.)

Despite the height of Mount Ratzmarker and its neighbours, most of the Boundary Ranges are considerably lower than the Pacific Ranges of the southern Coast Mountainsmarker. The larger icefields of 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 are 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 the Coast Range Arc.


See also

External links


  • S. Holland, Landforms of British Columbia, Province of British Columbia, 1976

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