Glacier Peak Wilderness (Wash.)

Glacier Peak Wilderness is a 566,057-acre (229,075 ha), 35-mile-long (56 km), 20-mile-wide (32 km) wilderness area located within portions of Chelan, Snohomish, and Skagit counties in the North Cascades of Washington. The area lies within parts of Wenatchee National Forest and Mount Baker National Forest and is characterized by heavily forested stream courses, steep-sided valleys, and dramatic glacier-crowned peaks. The dominant geologic feature of the area is 10,541-foot (3,213 m) Glacier Peak. It is the most remote major volcanic peak in the Cascade Range and is the third most heavily glaciated volcano in the lower forty-eight states behind Mount Rainier and Mount Baker. Glacier Peak is a volcanic cone of basalt, pumice, and ash which erupted during periods of heavy glaciation.