Hinderer Summit Series South Sister Titanium Blue Ano

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.