Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes system shared with Chile. This icefield is the world’s third largest reserve of fresh water. [Source]
The Perito Moreno Glacier is one of only three Patagonian glaciers that is growing. The reason remains debated by glaciologists. The terminus of the Perito Moreno Glacier is 5 kilometres (3 mi) wide, with an average height of 74 m (240 ft) above the surface of the water of Lake Argentino. It has a total ice depth of 170 metres (558 ft). [Source]
Los Glaciares National Park comprises an area of 4459 km². In 1981 it was declared a World Heritage Site by UNESCO. Its name refers to the giant ice cap in the Andes range that feeds 47 large glaciers, of which only 13 flow towards the Atlantic Ocean. The ice cap is the largest outside of Antarctica and Greenland. [Source]