olca

bgcolor=#e7dcc3 colspan=2\|Olca
gcolor=#e7dcc3\|Elevation:	17,739 ft (5,407 m)
gcolor=#e7dcc3\|Latitude:	20° 56′ 0″ S
gcolor=#e7dcc3\|Longitude:	68° 29′ 0″ W
gcolor=#e7dcc3\|Location:	Bolivia/Chile
gcolor=#e7dcc3\|Range:	Andes
gcolor=#e7dcc3\|Type:	Stratovolcano

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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