Bergschrund
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A bergschrund (from the German for ''mountain cleft''; sometimes abbreviated in English to "schrund") is a
crevasse A crevasse is a deep crack that forms in a glacier or ice sheet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rate ...
that forms where moving
glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...
ice separates from the stagnant ice or
firn __NOTOC__ Firn (; from Swiss German "last year's", cognate with ''before'') is partially compacted névé, a type of snow that has been left over from past seasons and has been recrystallized into a substance denser than névé. It is ice that ...
above. It is often a serious obstacle for
mountaineers Mountaineering, mountain climbing, or alpinism is a set of outdoor activities that involves ascending mountains. Mountaineering-related activities include traditional outdoor climbing, skiing, and traversing via ferratas that have become sports ...
. Bergschrunds extend to the
bedrock In geology, bedrock is solid rock that lies under loose material ( regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bed ...
, and can have a depth of well over . A bergschrund is distinct from a randkluft, which is a crevasse with one side formed by rock. The randkluft arises in part from the melting of the ice due to the presence of the warmer rock face. However, a randkluft is sometimes called a bergschrund. The French word ''rimaye'' encompasses both randklufts and bergschrunds. In a corrie or
cirque A (; from the Latin word ) is an amphitheatre-like valley formed by Glacier#Erosion, glacial erosion. Alternative names for this landform are corrie (from , meaning a pot or cauldron) and ; ). A cirque may also be a similarly shaped landform a ...
, the bergschrund is positioned at the rear, parallel to the back wall of the corrie. It is caused by the rotational movement of the glacier. In a longitudinal glacier, the bergschrund is at the top end of the glacier at a right angle to the flow of the glacier. It is caused by the downwards flow of the glacier. In winter, a bergschrund is often filled by snow from
avalanche An avalanche is a rapid flow of snow down a Grade (slope), slope, such as a hill or mountain. Avalanches can be triggered spontaneously, by factors such as increased precipitation or snowpack weakening, or by external means such as humans, othe ...
s from the mountain above it. In later summer, due to melting, it lies open and can present a very difficult obstacle to mountaineers. On the
South Col The South Col is a col between Mount Everest and Lhotse, the highest and fourth-highest mountains in the world, respectively. The South Col is typically swept by high winds, leaving it free of significant snow accumulation. Since 1950 (when Tibe ...
route to reach the summit of
Mount Everest Mount Everest (), known locally as Sagarmatha in Nepal and Qomolangma in Tibet, is Earth's highest mountain above sea level. It lies in the Mahalangur Himal sub-range of the Himalayas and marks part of the China–Nepal border at it ...
, a deep bergschrund lies at the bottom of the
Lhotse Lhotse ( ; ; ) is the List of highest mountains#List, fourth-highest mountain on Earth, after Mount Everest, K2, and Kangchenjunga. At an elevation of above sea level, the main summit is on the border between Tibet Autonomous Region of Chin ...
face, separating Camp II from Camp III.


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* {{Glaciers Glaciology Geological hazards Geographical terminology in mountaineering