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near Wahweap, Arizona (United States)
Very large, deep, straight-sided pits in Entrada sandstone. These are larger, deeper with straighter sides than potholes formed by water erosion along desert water courses. There is no evidence of water exit, except by evaporation or absorption by the sandstone below. A search on the internet will show you a collection of books and geological papers explaining this phenomena.
Current access to the beginning of this hiking route is by boat.
No place to anchor your boat here. Either leave someone with the boat or park at a nearby beach and kayak to this spot.