Omayra Sánchez Garzón (August 28, 1972 - November 16, 1985) was a 13-year-old Colombian girl killed in Armero, Tolima, by the 1985 eruption of the Nevado del Ruiz volcano. Volcanic debris mixed with ice to form massive lahars (volcanically induced mudflows, landslides, and debris flows), which rushed into the river valleys below the mountain, killing nearly 23,000 people and destroying Armero and 13 other villages.