The Sierra High Route is a 195 mile on and off trail route through the Sierra Nevada Mountains of California. It was established by Steve Roper and described by him in his book Sierra High Route: Traversing Timberline Country, first published in 1982. Roper did not really envision the High Route as a thru-hike, but rather imagined people would do it in sections, and he laid out his book that way.

South Sister (10358 ft) is the third highest peak in Oregon. It is the highest of the Three Sisters, near Bend, Oregon. The route to the summit is mildly technical (class 3) and ascends 5600 feet in about 6.25 miles.