3,870 ft
3,613 ft
0.5 mi

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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.

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Mooring point

trail head

No place to anchor your boat here. Either leave someone with the boat or park at a nearby beach and kayak to this spot.


  • sitton85 May 18, 2009

    These are called Gnamma pits.

  • Photo of ClipperCreekWanderer

    ClipperCreekWanderer May 18, 2009

    Thanks for the update.

    Here are some geologic references. These pits are in the vicinity of Cookie Jar bluff as mentioned in this article:

You can or this trail