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The double waterfalls of Huasca de Ocampo flow over very rare geometric basalt columns, known as Los Prismas Basálticos.
First brought to the attention of the outside world by naturalist Alexander Humboldt, the columns were formed by slow cooling of volcanic lava and are between 30 and 50 meters high.
Rock column formations like this are very rare, but can be seen in a few other places in the world including the Giant's Causeway in Northern Ireland, the Devil's Postpile in California, and Fingal's Cave in Scotland.
