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 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 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 the Coast Range Arc.

Subranges

• Boundary Range
• Cheja Range
• Chechidla Range
• Chutine Icefield
• Adam Mountains
• Ashington Range
• Burniston Range
• Dezadeash Range
• Florence Range
• Halleck Range
• Juneau Icefield
• Kahpo Mountains
• Kakuhan Range
• Lincoln Mountains
• Longview Range
• Peabody Mountains
• Rousseau Range
• Seward Mountains
• Snowslide Range
• Spectrum Range
• Stikine Icecap