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Rimrock, Arizona, USA. From the top of the sinkhole, looking east, it is evident that the arsenic in the water has not deterred vegetation. A few minutes after this photo was taken, a heron perched on the flat rock in the upper left, thought wisely did not swoop towards the water. Beneath the trees at the other end of the well are remnants of rock dwellings built into and out from the rock wall.
TicK