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The Nine Mile Canyon in eastern Utah, in the United States, is home to one of the largest concentration of native American rock art in North America. More than one thousand rock art sites has been identified in this area, with a conservative estimate of ten thousand individual engraving, but some archeologists suspect the actual numbers are more then ten times higher. It has been called "the world's longest art gallery".

The Nine Mile Canyon is actually 40 miles long, and was carved by the Nine Mile Creek, a small river that flows into the Green River. The name comes from the map of early explorer John Wesley Powell's cartographer, who did a nine-mile triangulation drawing while mapping the region.

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Photo credit: Bureau of Land Management/Flickr

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