4Paria Canyon, Vermilion Cliffs National Monument
Paria Canyon is located on the border of Arizona and Utah. Thus, you might also consider it an Arizona slot canyon too. The canyon features many miles worth of towering walls.
It is also the second-largest slot canyon on this list. Again, prepare to get wet as the mighty Paria River runs wall-to-wall in many areas. You will be doing some river hiking. Get a permit and go backpacking along the Paria all the way out to the rushing Colorado River at majestic Marble Canyon.
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