Las Pilas (or El Hoyo) is a complex volcano located in the western part of Nicaragua. Part of a 30-km-long volcanic massif, Las Pilas has a series of well-preserved flank vents surrounding a central cone. Las Pilas last erupted in the 1950s and before that possibly in the 16th century.[1]
An aerial image of the volcano appeared in the August 1944 issue of National Geographic Magazine (p. 180). On the slope near the peak, a curious circular 100-m diameter sinkhole visible in the 1944 photo is still present in 2020.