Los Glaciares National Park. The most striking sight is the famous Perito Moreno Glacier. This large glacier blocks a narrow channel formed by Lake Argentino thereby raising the water level temporarily. The 250 km2 (97 sq mi) ice formation, 30 km (19 mi) in length, is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes .Also This ice field is the world's third largest reserve of fresh water.