The Grosses Wannenhorn is a 3906-metre mountain in the Bernese Alps, in the Swiss canton of Valais near the village of Fiesch. It is part of the Walliser Fiescherhörner. The mountain separates the Aletsch Glacier to the west from the Fiescher Glacier to the east.
The Grosses Wannenhorn is rocky, while its southern counterpart, the Kleines Wannenhorn, is somewhat flatter. The mountain’s east side is heavily glaciated, while the west side is a steep slope intermittently broken by ice fields.
The mountain was first climbed by Gottlieb Studer and team in 1864.
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