evidence: The Southern Patagonian Ice Field: A Glacial Wonderland of Chilean and Argentine Patagonia [...] The Southern Patagonian Ice Field is a remarkable geological entity situated in the southern reaches of the Patagonia region. It is the more significant remnant of the Patagonian Ice Sheet, which covered south Chile during the last glacial period, locally known as the Llanquihue glaciation. Comprising both northern and southern lobes, the modern ice fields, though diminished from their peak around 18,000 years ago, still rank as the southern hemisphere's largest expanse of ice outside Antarctica. [...] An interesting geopolitical aspect of the Southern Patagonian Ice Field involves a 50-kilometer (30-mile) stretch of the Chile-Argentina border between Mount Fitz Roy and Cerro Murallón, which remains undefined on the ice field. This border section represents the last unresolved border issue between the two nations, highlighting the unique challenges the icy terrain poses.