|Elevation||5,407 m (17,740 ft)|
|Location||Bolivia, Potosí Department, Nor Lípez Province, San Pedro de Quemes Municipality, Cana Canton
Chile, Antofagasta Region, El Loa Province
Olca is a stratovolcano on the border of Chile and Bolivia. It lies in the middle of a 15 km long ridge composed of several stratovolcanos. Cerro Minchincha lies to the west and Paruma to the east. It is also close to the pre-Holocene Cerro Paruma. It is andesitic and dacitic in composition, with lava flows extending several kilometres north of the peak. The only activity from the ridge during historical times was a flank eruption from 1865 to 1867. The exact source of this eruption is unclear.
- "Olca-Paruma". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1505-05%3D.
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