Armero

…downslope, destroying the city of Armero and killing more than 25,000 in one of the country’s greatest catastrophes.

Much of the town of Armero, built on a low plain beside the Lagunilla River 50 km (30 miles) east of and nearly 5 km (3 miles) in elevation below the summit of Ruiz, was buried by the mudflows. Twenty-two thousand of its inhabitants were killed.