The Ruth Glacier, in Denali National Park and Preserve in the U.S. state of Alaska, covers an enormous area in the heart of the central Alaska Range. Located about 3 miles vertically below the summit of Mt. McKinley, it catches all the snow that falls on the southeast side of the mountain, and as the accumulated snow and ice that makes up the glacier slides down the slope, it get squeezed through a one-mile-wide bottleneck of what is called the Great Gorge.

The Great Gorge is one of the most spectacular gorges on earth. It runs for a length of 16 km and drops almost 2,000 feet over the distance, creating a grade that forces the Ruth Glacier to descend at an impressive pace of a meter a day. On either side of the gorge are solid granite cliffs that tower 5,000 feet above the glacier's surface. The depth of the ice within the gorge is more than 3,800 feet. If the ice were to melt tomorrow, it could create an abyss 2.6 km deep or more than one-half times deeper than the Grand Canyon.

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