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Keyhole Natural Bridge is located in Redwall Limestone in a tributary of 140-Mile Canyon. It has an approximate span of 40 feet and height of 100 feet. First-hand reports indicate that the Keyhole is "breathtaking" to see in person, but you certainly cannot tell this from the photos! This is a perfect example of how Grand Canyon arches can be spectacular to visit but not be photogenic. On average, about one person per year visits this lonely spot. Photo by Bob Moore.
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