2023 Map of South Sister

About this map

The volcanic peaks of the Three Sisters dominate this landscape, with South Sister marking a significant elevation point along the boundary of the Willamette National Forest and Deschutes National Forest. High-altitude glacial activity is clearly visible through numerous ice fields, including the Eugene Glacier, Prouty Glacier, and Lewis Glacier. The terrain reveals a complex history of volcanic eruptive centers and drainage patterns, from the expansive Rock Mesa to the waters of Linton Lake and Devils Lake. Significant trail networks, most notably the Pacific Crest National Scenic Trl, weave through the Three Sisters Wilderness, providing passage through a wilderness preserved for its geological and ecological value. The northeastern corner is further distinguished by the Whychus Creek Wild and Scenic River, highlighting the region's protected status.