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From the NPS site about the view: "The power of glaciers is evident throughout this view of Mt. Wilbur and Swiftcurrent Lake. Imagine giant tongues of ice, filling the valleys on either side of the peak and then joining together where the lake sits today. Bowl shaped amphitheaters (called cirques) sit at the heads of the valleys, the results of thousands of years of quarrying by ice. The cirque behind Mt. Wilbur holds Iceberg Lake, one of the most popular destinations in the park."