Las Pilas volcano is a volcanic complex near Cerro Negro volcano 75 km NW of the capital Managua.
The volcano consists of several cones around the central vent, Las Pilas, which contains a 700 m wide and 120 m deep crater and is the site of the recent activity.
El Hoyo is a 150 m deep pit crater immediately SW of the main crater. It contains particularly strong fumaroles and produces sometimes dense plumes of gas and steam.
The only certain historic activity from Las Pilas were 2 phreatic eruptions from a fissure on the eastern side of Las Pilas cone in 1952 and 1954. An eruption in the 16th century is uncertain.