Cerro Negro is the second youngest volcano in the American Continent, and one of the most active and most interesting volcanoes in the region. It is a type of Hawaiian volcano with an altitude of 726 meters above sea level and still growing. It was formed in April 1850 erupting 18 times since then. It erupted last in 1999 creating a new crater at its base.
The volcanic activity here has made it impossible for trees and plants to grow on the steep, black slopes. Some slopes are covered by huge volcanic rocks, others by fine volcanic sand.