Volcán Cerro Machín

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, 17,060 feet (5,200 m); Santa Isabel, 16,240 feet (4,950 m), Nevado del Ruiz, 17,457 feet (5,321 m), plus nine other lesser volcanoes and a 10,000 feet (3,000 m) volcanic South Wall containing in excess of thirty volcanic domes.