Glaciar Perito Moreno, a towering wall of ice above Lago Argentino
Published on 09/17/2026 at 16:11 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Glaciar Perito Moreno is a vast valley glacier in southern Patagonia, where dense blue ice forms a towering wall above the waters of Lago Argentino west of El Calafate in Argentina’s Santa Cruz Province. It flows from the Southern Patagonian Ice Field within Los Glaciares National Park, a protected landscape recognised as a UNESCO World Heritage Site in 1981, and offers visitors an unusually close encounter with a moving river of ice.
Glaciar Perito Moreno in the Patagonian landscape
Glaciar Perito Moreno sits in the western reaches of Santa Cruz Province, in the Andean foothills above the steppe that surrounds El Calafate. The glacier belongs to Los Glaciares National Park, which was inscribed on the World Heritage List in 1981 for its concentration of large valley glaciers and dramatic mountain sceneryLos Glaciares National Park. From the high plateau of the Southern Patagonian Ice Field, the ice flows down through a mountain valley until it meets the southern arms of Lago Argentino.
The glacier’s front forms a near-vertical face of jagged ice where it reaches the lake, with cliffs that rise more than 60 m (about 200 ft) above the water and continue downward to an estimated total ice thickness of around 170 m (558 ft) near the terminusice height and depth. Along the shore the calving front stretches for roughly 5 km (3 mi), so the visitor looks not at a single peak but at an entire frozen frontage pressed against the lake’s surfacewidth of the glacier front. Behind this edge, the glacier’s body extends for about 30 km (19 mi) back into the mountains and covers an area in the order of 250 km², making it comparable in size to a major urban districtglacier length and area.
A glacier named for Francisco Moreno
The glacier takes its present name from Francisco Moreno, an Argentine explorer and polymath who lived from 1852 to 1919 and played a central role in surveying Patagonia. His work in the late nineteenth and early twentieth centuries helped establish Argentina’s knowledge of its southern territories, and his legacy endures here in the naming of Glaciar Perito Morenonamed after Francisco Moreno. Earlier designations such as Bismarck Glacier and Francisco Gormaz Glacier appear in historical records, but the Perito Moreno name is now firmly established.
Glaciar Perito Moreno forms part of the Southern Patagonian Ice Field, a vast body of ice recognised as one of the world’s largest reserves of fresh waterSouthern Patagonian Ice Field context. In this region, precipitation over the high Andes accumulates as snow, compacts into dense ice and then flows slowly west and east, feeding outlet glaciers like Perito Moreno that descend into the surrounding valleys. Measurements indicate that the glacier has a surface area of around 250 km² and extends to ice depths in the order of 170 m at the front, with thicker sections towards its central flowlinearea and thickness estimates. These figures give Glaciar Perito Moreno a clear physical presence among the surrounding hills, forests and lake arms of Patagonia.
Living ice: movement, colour and calving
Although Glaciar Perito Moreno may appear static from a distance, it is in continuous motion, advancing along its valley at a measured rate of around 2 m per day in some monitored sectionsdaily advance rate. This flow reflects a balance between ice gain from snowfall in the accumulation zone and ice loss through melting and calving at the lake front. Unlike many large glaciers worldwide that have been observed to retreat, Perito Moreno has been described as being in a near-equilibrium state, with its gains and losses roughly aligned over recent decadesmass balance characteristics. The consequence for visitors is a front that remains close to the shore, with ice cliffs that do not lie far away across open water.
At the contact with Lago Argentino, the glacier’s front is broken into spires, ridges and deep crevasses, and sections of ice periodically detach from the face and fall into the lake as calving events. Over time, the advancing ice can reach the Magallanes Peninsula and block one arm of the lake, forming a natural ice dam which impounds water until pressure and erosion eventually open a channel and the barrier collapsesice dam description. The surface of the glacier, visible from viewpoints and boat tours, shows an intricate relief of ridges and crevasses, with variations in colour where light passes through different depths of compressed icesurface structure and colour. In clear conditions, the contrast between the glacier’s pale blue ice, the dark rock of the valley sides and the milky turquoise of the lake is one of the defining visual impressions of this part of Patagonia.
Visiting Glaciar Perito Moreno: what travellers from Western Europe should know
- Glaciar Perito Moreno lies west of El Calafate in southern Argentina, within Los Glaciares National Park in Santa Cruz Province, beside the southern arms of Lago Argentino. Road access runs from El Calafate towards the park and the lake shore.
- The main viewpoints and walkways overlook the glacier from the Magallanes Peninsula, where paths and platforms follow undulating terrain with steps and changes of level above the lake; sturdy footwear helps on the mixed surfaces.
- Boat excursions operate on Lago Argentino near the glacier’s front, reaching areas where the ice cliffs rise directly from the water; motion on board combines lake swell with the sound of calving ice when pieces break away.
- The official language is Spanish and the currency is the Argentine peso.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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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, in southwest Argentina, west of the town of El Calafate and beside Lago Argentino.
What should visitors expect when they reach the glacier?
Visitors encounter a broad calving front of dense blue ice rising more than 60 m above the lake, with walkways and viewpoints on nearby slopes and boat routes approaching the glacier’s face.
What makes Glaciar Perito Moreno distinctive among glaciers?
Glaciar Perito Moreno combines a stable, advancing valley glacier with a lake-front terminus that is unusually close to accessible shores, creating a prominent ice wall and periodic natural dam events on Lago Argentino.
