
thumb|El Zacatón with free floating grass island (lower right), Municipality of Aldama, Tamaulipas, Mexico Zacatón is a thermal water-filled sinkhole belonging to the Zacatón system – a group of unusual karst features located in Aldama Municipality near the Sierra de Tamaulipas in the northeastern state of Tamaulipas, Mexico. At a total depth of , it is one of the deepest known water-filled sinkholes in the world.
thumb|El Zacatón with free floating grass island (lower right), Municipality of Aldama, Tamaulipas, Mexico Zacatón is a thermal water-filled sinkhole belonging to the Zacatón system – a group of unusual karst features located in Aldama Municipality near the Sierra de Tamaulipas in the northeastern state of Tamaulipas, Mexico. At a total depth of , it is one of the deepest known water-filled sinkholes in the world.
Using an autonomous robot, the underwater portion of Zacatón has been measured to be deep (a difference between the rim of cliff and surface of water adds to the total depth). Zacatón is the only sinkhole of the five located in Rancho La Azufrosa to have any noticeable water flow.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).