Glaciar Perito Moreno and the advancing ice wall of Patagonia
Published on 09/19/2026 at 09:45 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Glaciar Perito Moreno is a vast river of ice in southern Patagonia, west of El Calafate in Argentina’s Santa Cruz Province, where the Southern Patagonian Icefield descends towards Lago Argentino. The glacier forms part of Los Glaciares National Park, a protected landscape recognised as a UNESCO World Heritage Site in 1981 and named after the nineteenth-century explorer Francisco Moreno, whose surveys helped define the frontier between Argentina and Chile.Glaciar Perito Moreno
The ice front above Lago Argentino
The defining experience of Glaciar Perito Moreno is the encounter with its frontal ice wall where the glacier pushes into the waters of Lago Argentino. The glacier’s terminus extends for about 5 km (3 mi), creating a continuous cliff of compacted ice that rises roughly 60 to 70 m (197 to 230 ft) above the lake surface, with the total depth of the ice reaching around 170 m (558 ft) from top to base.terminus five kilometres wide From the shore, the front appears as an intricate facade of ridges and overhangs, streaked with bands where older, compressed layers of ice have been pushed up from within the glacier.
The contrast between the pale glacier and the waters of Lago Argentino defines the visual character of the site. The lake occupies a broad basin formed where ice tongues from the Southern Patagonian Icefield descend from the Andes at elevations of over 2,000 m (6,562 ft) down to about 180 m (591 ft) above sea level.Southern Patagonian Icefield descends At Glaciar Perito Moreno the lake narrows into arms such as Brazo Rico and the Canal de los Témpanos, where floating ice fragments drift away from the glacier’s face.
A glacier that advances and dams a lake
Glaciar Perito Moreno is notable among Patagonian glaciers for maintaining a broadly stable position, advancing at the same order of magnitude as its ice loss. The glacier spans roughly 250 km² (96.5 sq mi) and stretches about 30 km (18.6 mi) from its origin in the icefield to its lakefront.Perito Moreno covers 250 square kilometres Estimates of its daily advance rate suggest that the ice can move around 2 m (6.6 ft) per day at the front, a pace that underpins the glacier’s dynamic behaviour.
One of the most striking consequences of this advance is the periodic damming of Brazo Rico, the southern arm of Lago Argentino. As the glacier’s tongue pushes across the lake, it can reach the opposite shoreline and form a grounded wall of ice that blocks the flow of water between Brazo Rico and the main body of the lake.natural ice dam Water levels in Brazo Rico then rise significantly above those in the rest of Lago Argentino until the pressure of the impounded water contributes to rupturing the ice barrier, sending torrents and broken blocks of ice downstream into the lake.
Patagonian landscape and national park setting
Glaciar Perito Moreno lies within Los Glaciares National Park in the south-west of Santa Cruz Province, forming part of a wider system of glaciers fed by the Southern Patagonian Icefield.Los Glaciares National Park The park extends from high Andean ridges down to the shores of Lago Argentino and includes other glaciers and peaks, but Glaciar Perito Moreno occupies a particularly accessible position facing the Magallanes Peninsula on the southern side of the lake. The glacier is located roughly 75 to 80 km (47 to 50 mi) west of El Calafate, linked to the town by a paved road along the lakeshore.about 80 kilometres west of El Calafate
The broader landscape combines steep, ice-carved valleys and rock headlands with stretches of Patagonian steppe. At the glacier’s front, dense lenga and ñire woodland and shrub cover appears in patches on surrounding slopes, while higher up the terrain gives way to bare rock and snowfields. The Southern Patagonian Icefield itself covers hundreds of kilometres, and Glaciar Perito Moreno represents one outlet where that elevated sheet of ice flows down towards a low-altitude lake basin, making the transition from plateau to valley visible from nearby viewpoints.geoheritage description of the glacier
Visiting Glaciar Perito Moreno: what travellers from Western Europe should know
- Glaciar Perito Moreno lies west of El Calafate in southern Argentina, reached by the paved provincial road that runs along the southern shore of Lago Argentino towards Los Glaciares National Park.
- Walkways and viewpoints stand on solid ground across the lake from the glacier’s front, with level paths interspersed with staircases and platforms that require sustained walking.
- The surrounding terrain combines exposed lakeside sections and wooded slopes, and weather conditions can vary quickly, with wind and cloud affecting visibility.
- El Calafate is the nearest town of any size, with an airport and road connections into the wider region of southern Patagonia.
- The official language is Spanish and the currency is the Argentine peso.
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Frequently asked questions about Glaciar Perito Moreno
Where is Glaciar Perito Moreno located?
Glaciar Perito Moreno is in Los Glaciares National Park in Santa Cruz Province, southern Argentina, about 75 to 80 km west of the town of El Calafate along the shore of Lago Argentino.
What can visitors expect when they reach the glacier?
Visitors encounter a wide cliff of ice rising around 60 to 70 m above Lago Argentino, seen from walkways and platforms on the Magallanes Peninsula that face the glacier’s advancing front.
What makes Glaciar Perito Moreno distinctive among Patagonian glaciers?
Glaciar Perito Moreno stands out for its advancing, largely stable front that can dam Brazo Rico, periodically cutting off this arm of Lago Argentino and leading to dramatic ruptures when the ice barrier fails.
