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Photo: Edgar from Ibagué, Colombia, CC BY-SA 2.0 via Wikimedia Commons
An active stratovolcano. The volcano has erupted many times in recent history, most famously in 1985 when it killed more than 20,000 people in the town of Armero, which was buried by the world's largest recorded lahar. It's possible to hike to the snowline at 5200 m of this volcano.
Nevado del Ruiz, also known as La Mesa de Herveo is a volcano on the border of the departments of Caldas and Tolima in Colombia, being the highest point of both. It is located about 130 km (81 mi) west of the capital city Bogotá. It is a stratovolcano composed of many layers of lava alternating with hardened volcanic ash and other pyroclastic rocks. Volcanic activity at Nevado del Ruiz began about two million years ago, during the Early Pleistocene or Late Pliocene, with three major eruptive periods. The current volcanic cone formed during the present eruptive period, which began 150,000 years ago.
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