Zacatón (El Zacatón sinkhole) is thermal water filled sinkhole belonging to Zacatón system - group of unusual karst features located in Aldama Municipality in the northeastern state of Tamaulipas, Mexico. It is the deepest known water-filled sinkhole in the world with a total depth of 339 metres (1,112 ft).
Zacatón Sinkhole
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By Parabellum @ 2011-10-10 06:38:15