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See Knife Creek Glacier & Mount Katmai Caldera, Katmai National Park, Alaska

The lower slopes of the Knife Creek Glaciers are covered with as much as 6 feet (2 meters) of ash and pumice. Hikers can walk right up to the foot of and even on the glaciers, with caution. This portion of one of the glaciers is also covered in landslide debris from Trident Volcano.Three thousand feet above the glaciers lays the caldera of Mount Katmai. The summit of Mount Katmai collapsed during the 1912 Novarupta eruption leaving a caldera more than 2000 feet (600 m) deep. All routes to the caldera require crossing glaciers with crevasses.
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