A mountainous sub-region within the Northwestern Washington Cascades, bounded by Marble Creek, Dorado Col, West Fork Thunder Creek, Fisher Creek, Fisher Pass, North Fork Bridge Creek, upper Stehekin River, Cascade Pass, and North Fork Cascade River. Notable landforms include Hidden Lake Peak, Eldorado Peak, Forbidden Peak, Boston Peak, Sahale Peak, Mt. Buckner, Mt. Logan, and Mt. Goode.
Inspiration–Isolation Traverse: Borealis Glacier to Colonial Glacier + Primus Peak + Eldorado Peak + Isolation Peak + Snowfield Peak (McAllister Mountains, WA)
Trip Date: June 29 – July 6, 2019 Inspiration–Isolation Traverse aka McAllister Traverse: Borealis Glacier to Inspiration Glacier to Colonial
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