At 5230 meters, Sangay Volcano is an active [stratovolcano] in central Ecuador. It is one of the highest active volcanoes in the world and one of Ecuador's most active ones, erupting three times in recorded history. It shows mostly Strombolian activity. The most recent eruption, which started in 1934, is still ongoing. Geologically, Sangay marks the southern bound of the Northern Volcanic Zone, and its position straddling two major pieces of crust accounts for its high level of activity. Sangay's approximately 500,000 year old history is one of instability. Two previous versions of the mountain were destroyed in massive flank collapses, evidence of which still litters its surroundings today. Sangay is one of two active volcanoes located in the namesake Sangay National Park, the other being Tungurahua to the north. The Park has been listed as a UNESCO World Heritage Site since 1983.