Reventador is an active stratovolcano that lies in the eastern Andes of Ecuador. Since 1541, it has erupted over 25 times, with its most recent eruption in 2009, but the largest historical eruption occurred in 2002. During that eruption, the plume from the volcano reached a height of , and pyroclastic flows went up to from the cone. On March 30, 2007, the mountain spewed ash again. The ash reached a height of about .