JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
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Tourists at a geothermal pool on rock terrace, Hierve el Agua, Oaxaca state, Mexico. This site includes waterfall-like rock formations or curtains that rise many metres from the valley below to a set of artificial and natural pools on a shelf looking out over the surrounding mountains. The larger pools are used for swimming. The water rises from hot springs and deposits these calcium carbonate mineral rock formations.
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