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Rimrock, Arizona, USA. This limestone sinkhole is a historic site and natural phenomenon. Inhabited by indigenous people for over 10,000 years, dwellings were built in 600. Cliff dwellings are visible above the well. Below the vantage point for this photo were other, more recent (1000-1400) dwellings remnants. The well is 386 feet across and of undetermined depth. Spring fed, over 1.5 million gallons of water flow through the sinkhole. Beginning is 700, an irrigation canal was dug to divert water for farming, the canal being 7 miles long. The water in the well is not potable. It has high levels of carbon dioxide and contains high levels of arsenic. Only five types of animals can survive in the water - a miniature amphipod, a leech, tiny snail, water scorpion and one-cell diatom.