HomeUSAOregonOregon VolcanoesThree Sisters WildernessSouth SisterSouth SisterLAT,LNG 44.10230, -121.77140CREATED UPDATED Edit MapShareDescription[Edit]South Sister is the third highest peak in Oregon. It has several glaciers and at least nine routes. The most popular route is the South Side Route. Expect crowds on the weekends. The rock is volcanic crap.2 ClimbsComing soon: New Climbs1North Ridge4thTrad · Alpine2Old Crater Route3rdTrad · Alpine