Three Sisters

Description

Three Sisters is a cluster of three volcanic peaks, North Sister, Middle Sister, and South Sister, located in Central Oregon. North Sister is the oldest of the three, and Middle Sister formed from eruptions in North Sister's flank. South Sister is the youngest, and is believed to have erupted as recently as 1853. South Sister is also the highest, as her siblings have eroded with time. The three peaks are the third, fourth and fifth highest peaks in Oregon, behind Mount Hood and Mount Jefferson. All three peaks are located within the Three Sisters Wilderness Area, and are easily accessible from the Pacific Crest Trail.