The Three Sisters are a complex volcano of three volcanic peaks of the Cascade Volcanic Arc and the Cascade Range in the U.S. state of Oregon. Each exceeding 10,000 feet (3,000 m) in elevation, they are the third-, fourth-, and fifth-highest peaks in the state of Oregon, and are located in the Three Sisters Wilderness, about 10 miles (16 km) south of the nearest town of Sisters. Diverse species of flora and fauna inhabit the area on and around the mountains, which is subject to frequent snowfall, occasional rain, and extreme temperature differences between seasons. The mountains, particularly South Sister, are popular for climbing and scrambling.
Although they are often grouped together and seen as one unit, the three mountains evolved under differing geologic situations, and the petrologic composition of each mountain can vary significantly. Whereas North Sister is extinct and Middle Sister is dormant, South Sister last erupted about 2,000 years ago and still could erupt, threatening life within the region. After satellite imagery detected tectonic uplifting near South Sister in 2000, the United States Geological Survey made plans to improve monitoring in the immediate area.
There's a hiking trail (T2) called South Sister Climber Trail #36 leading to the summit. South Sister is one of the 1 peaks along the South Sister Climber Trail.
By elevation South Sister is
# 43 out of 4345 in the Cascade Range # 2 out of 315 in Willamette National Forest # 1 out of 249 in Deschutes National Forest # 4 out of 4749 in Oregon # 1 out of 223 in Deschutes County # 1 out of 398 in Lane County # 1 out of 53 in Three Sisters Wilderness
By prominence South Sister is
# 9 out of 4345 in the Cascade Range # 2 out of 315 in Willamette National Forest # 1 out of 249 in Deschutes National Forest # 86 out of 91437 in USA # 4 out of 4749 in Oregon # 1 out of 223 in Deschutes County # 1 out of 398 in Lane County # 1 out of 53 in Three Sisters Wilderness
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