Colachi is a stratovolcano in the Antofagasta Region of northern Chile. It was built on a basement of ignimbrites. A 7 km² silicic lava flow lies on the saddle between the volcano and Acamarachi.Colachi is part of a chain of stratovolcanoes stretching along the eastern side of the Salar de Atacama the most active of which being Lascar.
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