Cerro Machín is a stratovolcano located in Tolima Department, Colombia. Considered the most dangerous active volcano of Colombia, Cerro Machin is a volcanic plug that is approximately the same age (1,000,000+ years) as the Ruiz-Tolima Massif and has the appearance of being part of that volcanic system.
Cerro Machín is a 2.4km-wide tuff ring volcano. It was last known to actively erupt 800 years ago.
Its sisters are Nevado del Tolima, ; Santa Isabel, , Nevado del Ruiz, , plus nine other lesser volcanoes and a volcanic South Wall containing in excess of thirty volcanic domes.
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See also Nevado del Ruiz Mauna Loa
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