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Atacazo is a volcano of the Western Cordillera, southwest of Quito, Ecuador. It lies 25 kilometers south-west of Quito. Southwest of Atacazo is another volcano known as Ninahuilca. The Atacazo is a stratovolcano.It was formed by the action of a Late-Pleistocene to Holocene caldera. The last eruption of the Atacazo was nearly 2300 years ago.
- ^ "Atacazo". Smithsonian Institution. Retrieved 24 January 2013.