Elevation: 10, 358 ft. Location: Lane / Deschutes counties, Oregon, U.S. Type of Rock: Stratovolcanoes and shield volcanoes Age: < 50,000 years old Last Eruption: about 50 BC
The South Sister is a part of the Three Sisters unit, and is the youngest and tallest volcano of the trio. The Three Sisters are located on the boundary of Lane and Deschutes County, and the Willamette and Deschutes National Forest. South Sister has an intact summit crater about 0.25 mi in diameter with a small crater lake, Teardrop Pool, which is the highest lake in Oregon. Rick Hinderer plans to climb the South Sister in the near future. The Hinderer South Sister bead resembles the mountain in that it has 3 peaks to represent each sister in the trio.