evidence: The most famous of Ice Field adventurers is the legendary English mountaineer Eric Shipton who led several successful expeditions. In 1960, Shipton together with fellow Englishman Jack Ewer, a professor at the University of Chile and accomplished Chilean climber Cedomir Marangunic completed a 52-day crossing of the ice field from Jorge Montt Glacier to the edge of the Upsala glacier and over a series of peaks, including Cerro Murallon. Shipton later crossed the Northern Ice Field from west to east, starting at San Rafael Glacier and finishing at the Cochrane river, making the first ascent of Cerro Arco in the process. [...] The Patagonian Ice Field largely remains a frontier landscape, with part of the border still not agreed upon by Chile and Argentina. A particular point of contention is a 50km stretch of border between Mount Fitz Roy and Cerro Murallon which remains the only contested area following the demarcation of 24 disputed borders in 1990. Territorial disputes remain unresolved as each country eyes the enormous freshwater resources preserved in the glacial ice.