Hierve El Agua (Boiling Water)
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This location about 25 miles east of the city of Oaxaca, features natural
springs that contain a lot of carbon dioxide gas dissolved in the water.
When the springs emerge, the gas bubbles out making it appear that the
water is boiling. The slight acidity of the water carries large amounts of
dissolved minerals as well. As the springs emerge high on a mountainside,
the water flows over the edge depositing the dissolved minerals in a sort
of 'petrified waterfall.' Seeing the huge quantity of deposits makes us
think that there must be some vast caverns beneath the mountain
somewhere.