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Cerro Aucanquilcha, Chile, 2016-02-10, DD 15.JPG
Highest point
Elevation 5,407 m (17,740 ft)
Coordinates 20°56′0″S 68°29′0″W / 20.93333°S 68.48333°W / -20.93333; -68.48333
Location Bolivia, Potosí Department, Nor Lípez Province, San Pedro de Quemes Municipality, Cana Canton
Chile, Antofagasta Region, El Loa Province
Parent range Andes
Mountain type Stratovolcano
Last eruption 1867

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.

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