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10 of the most beautiful slot canyons

The Wave in Arizona

Photo: Mikhail Kolesnikov/Shutterstock

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The Wave, Arizona

The Wave is a surreal-looking geological formation in Arizona, made by two water-eroded troughs, one of which is only 7 feet wide and falls into the category of slot canyon. Because it is an incredibly popular place for tourists, sightseers, hikers and photographers, only 20 hikers a day are allowed to visit and walk through the 52-foot long slot canyon and the 62-foot-wide (and more photographed) neighboring trough, to avoid damage and erosion caused by human feet. The Wave is considered to be one of the most photographed landscapes in the United States, and no wonder.