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Photo: This image was taken by the NASA Expedition 21 crew Image acquired with a Nikon D2Xs digital camera fitted with a 400 mm lens, and is provided by the ISS Crew E, Public domain via Wikimedia Commons
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.
The Upsala Glacier is a large valley glacier on the eastern side of the Southern Patagonian Ice Field. Its higher portion lies in a disputed territory between Chile and Argentina. While the glacier flows from north to south it has three lesser eastflowing tributary glacier: Bertacchi, Cono and Murallón. Each year, over 700,000 tourists visit Los Glaciares National Park, where this glacier is located, but most go to Perito Moreno glacier as it has easier accessibility.
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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.