This glacier is located in Los Glaciares National Park, created in 1937 and recognized as a World Heritage Site in 1981 by UNESCO. It is 60 m high and 5 km wide, with an area of 250 km². It was formed during the last Glacial Age by snow compaction, and it is constantly changing its shape and position, like a huge ice river which comes down from the mountains’ cliffs. Glaciers like this have a central role in shaping the landscape of Patagônia, since they carry big rock blocks which erode the terrain where they pass through. Sometimes, the massive ice wall touches Lake Argentino’s margins, right in front of it, and make the waters of the lake rise up to 30 m. The water pressure creates a hole in the ice, which colapses and give the lucky viewers an incredible show.