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Arenal is one of seven historically active Costa Rican volcanoes and it was Costa Rica's most active volcano until 2010, and one of the ten most active volcanoes in the world. Arenal has several eruptive vents. Chato is a dormant stratovolcanic cone which first erupted 38,000 years ago during the Pleistocene period and last erupted about 3,500 years ago. Chatito is a lava dome with an elevation of 1,100 metres (3,609 feet). Espina is another lava dome.[