Hierve el Agua
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Hierve el Agua (Spanish for "the water boils") is set of natural rock formations in the state of Oaxaca, Mexico, that look like waterfalls. The site is located about 30 kilometers east of Mitla, Oaxaca. Relatively small amounts of water, which despite the name is cool water, bubble up from various spots and, running over the cliffs, evaporate, leaving the rock formations behind. It is much the same process as forms stalactites and stalagmites in caves, but in this case takes place on the side of a mountain.
The formations are very high: the picture in the gallery with tourists on top of the "waterfall" gives an idea of the scale.
There are cabins for overnight accommodation at the site, and the water is pooled in two places, and one can wade or swim in it. Trails allow for hiking to the bottom of the rock formations and to various other places in the vicinity.