Cenotes are natural pits, wells or sinkholes. In South America, cenotes have a history of being used as places of worship, due to the belief of the Ancient Mayas that the rain god Chaak resides within them. To this day some Maya farmers appeal to Chaak for rain. Sometimes, cenotes were being used for more worldly purposes though. In the picture shown, the cenote is being used as a waterhole in an otherwise rather dry area.
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Photo Credits / Sources:
Frederick Catherwood [Public domain], via Wikimedia Commons