Grosser Aletschgletscher and the long river of ice above Fiesch
Published on 08/31/2026 at 19:58 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Grosser Aletschgletscher above Fiesch in Switzerland is the largest glacier in the Alps, a long river of ice curving between high peaks of the Bernese Alps in the canton of Valais.largest glacier in the Alps The glacier lies above the upper Rhône valley, forming a broad band of ice framed by dark rock and snowfields.
The glacier’s scale and high-mountain setting
Grosser Aletschgletscher has a length of about 23 km (14 mi), with an area measured in several tens of square kilometres across the eastern Bernese Alps.23 km long Its ice volume lies in the range of many cubic kilometres, making it a central mass of ice in the high alpine landscape.ice volume figure The glacier surface flows from accumulation basins beneath peaks such as Jungfrau and Mönch down towards the Massaschlucht and the Rhône valley, dropping across a large height range within Valais.southward flow in Valais
The high-mountain setting is shaped by surrounding summits and subsidiary glaciers that feed into Grosser Aletschgletscher. Firn fields and glacier branches converge at Konkordiaplatz, a broad basin where the ice thickness reaches several hundred metres according to alpine inventories.ice thickness at Konkordiaplatz From there the glacier narrows into a tongue that descends towards its lower terminus, where the altitude falls to around 1,550 m (5,085 ft) above sea level.altitude of glacier tongue
A World Heritage landscape of ice and rock
Grosser Aletschgletscher forms the central glacier body of the Swiss Alps Jungfrau-Aletsch World Heritage landscape, a large protected area recognised for its glacial forms and high mountain structure.Swiss Alps Jungfrau-Aletsch The inscription of Swiss Alps Jungfrau-Aletsch on the UNESCO World Heritage List in 2001 gives this glacier and its surroundings a formal status as a natural landscape of international significance.World Heritage designation
Within this wider area, Grosser Aletschgletscher lies on the southern side of the Bernese Alps in south-western Switzerland. The glacier’s accumulation basins are bordered by well-known four-thousand-metre peaks, and its surface lies between roughly 1,575 m (5,167 ft) and over 4,000 m (13,123 ft) above sea level.altitude range This height difference gives the glacier a marked longitudinal profile, visible from viewpoints along the southern rim where the ice can be seen bending between rugged ridges and rock walls.
Grosser Aletschgletscher above Fiesch and the Aletsch Arena
Fiesch stands in the upper Rhône valley in the canton of Valais and forms one of the access points to the southern terraces above Grosser Aletschgletscher.Fiesch as access point From the village, mountain transport systems lead to Fiescheralp, a high plateau on the southern side of the glacier basin, which belongs to the Aletsch Arena, a group of high terraces and viewpoints overlooking the ice.Aletsch Arena terraces
Higher stations such as Eggishorn provide wide views over Grosser Aletschgletscher, including the curving upper section and the long tongue reaching down towards the valley. Eggishorn lies close to 2,900 m (9,514 ft) above sea level and is described as the highest of several viewpoints along the southern rim, offering sightlines across the glacier to summits like Eiger, Mönch and Jungfrau.Eggishorn viewpoint Paths from these high terraces lead towards glacier margins and alpine lakes, with routes connecting Eggishorn, Märjelensee and Fiescheralp across rocky and sometimes steep terrain.
Visiting Grosser Aletschgletscher: what travellers from Western Europe should know
- Grosser Aletschgletscher lies above the village of Fiesch in the upper Rhône valley in the Swiss canton of Valais. Fiesch is reached by rail and road connections from other parts of Switzerland.
- From Fiesch, cable cars and mountain transport systems ascend to Fiescheralp and onward to viewpoints such as Eggishorn above the southern rim of the glacier basin.
- The terrain on and around Grosser Aletschgletscher is high-alpine, with significant altitude differences, rocky paths and sections that cross or approach glacier margins, which require firm footwear and mountain awareness.
- The official language in this part of Switzerland is German and the currency is the Swiss franc.
- 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 Grosser Aletschgletscher
Where is Grosser Aletschgletscher located?
Grosser Aletschgletscher lies in the eastern Bernese Alps in the Swiss canton of Valais, above the upper Rhône valley and the village of Fiesch.
What can travellers expect when visiting Grosser Aletschgletscher?
Travellers encounter a long glacier flowing through a high-alpine landscape of rock, snowfields and surrounding peaks, viewed from terraces and viewpoints such as Fiescheralp and Eggishorn.
What makes Grosser Aletschgletscher distinctive among Alpine glaciers?
It stands out for its length of about 23 km, its large area and volume, and its role as the central glacier body within the Swiss Alps Jungfrau-Aletsch World Heritage landscape.
