Aserac (/səˈræk,ˈsɛræk/; fromSwiss Frenchsérac[seʁak], a type ofcheese) is a block or column of glacialice, often formed by intersectingcrevasses on aglacier. Commonly house-sized or larger, they are dangerous tomountaineers, since they may topple with little warning. Even when stabilized by persistent cold weather, they can be an impediment to glacier travel.
Seracs are found within anicefall, often in large numbers, or on ice faces on the lower edge of ahanging glacier.[1] Notable examples of the overhanging glacier edge type are well-known obstacles on some of the world's highest mountains, includingK2 at "The Bottleneck" andKanchenjunga on the border of India and Nepal. Significant seracs in theAlps are found on the northeast face ofPiz Roseg, the north face of theDent d'Hérens, and the north face ofLyskamm.
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