The Viedma Glacier is a glacier located on Lake Viedma and is part of the Southern Ice Field.
It is the largest glacier in the Los Glaciares National Park, followed by the Upsala and the second largest in the southern hemisphere only after the Pío XI Glacier.
Its source is SE of the Lautaro Volcano and its length is 70 km, which is why it is the longest glacier in South America. It is also known by the three bands of ash product of past eruptions of said volcano. It descends from the Southern Patagonian Ice Field and runs in a canyon formed between the hills Huemul and Campana, finally ending at Lake Viedma.