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Photo: Fernando, CC BY-SA 4.0 via Wikimedia Commons
Probably the best known in the park. It is a geographical exception because it divides an arm of Lake Argentino into two parts. If the water level in the upper arm is high enough, the glacier bursts with a deafening roar. This spectacle occurs roughly every 4 to 10 years and never lasts more than 2 or 3 days.
The Perito Moreno, Francisco Gormaz or Bismarck Glacier is a glacier located in Los Glaciares National Park in southwest Santa Cruz Province, Argentina, and originated in the Magallanes Region in Chile, being also part of the Bernardo O'Higgins National Park. It is one of the most important tourist attractions in the Argentine Patagonia.
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Also on Lake Argentino, the largest glacier in the park. It is approached by boats, but its "wall" is less attractive than that of Perito Moreno. The boat tour is still worth it, because you get very close to the glacier and the icebergs that have separated from it. The landscape partly resembles that of Antarctica. The starting point for the hike to the viewpoint at Refugio Upsala can also be reached by boat.