 One of its main attractions is the Glacier Pío XI, from which enormous ice blocks periodically spall.The Pío XI glacier is the largest glacier in the southern hemisphere outside of Antarctica, covering an area of , and has advanced over the past 50 years by more than ; one of its tongues measures approximately .The ice face of the glacier is approximately in height (about 30 floors of a conventional building) and the falling ice generates waves exceeding in height; significant enough to rock larger vessels.