The Perito Moreno glacier is a thick mass of ice located in the Los Glaciares National Park.
This glacier originates in the Southern Patagonian ice field. In its descent, it reaches the southern arm of Lake Argentino, with a front of 5 km in length, surfacing on the water with a height of about 60 m.
Thanks to its constant progress, it forms a dam with the waters of the Rico arm of said lake, which generates a drop in relation to the rest of the lake of up to 30 m. Due to the pressure of this liquid mass, leaks occur in the ice creating a tunnel with a vault over 50 m high. The collapse of this vault constitutes an unusual natural spectacle and is one of the main attractions of the park.