One of the largest sinkholes in the unique Sistema Zacatón is Poza Tule. This sinkhole has a diameter of some 200 – 250 m.

Sistema Zacatón is an area with incredible characteristics unparalleled in the world. In total, this area contains some 20 unusual features – sinkholes, caves, springs created by deep groundwater heated by volcanic processes. Karstification processes here continue today as well – acidic groundwater continues to strip away the limestone and deposits it in unusual travertine formations.

Sinkhole with triple bottom

Rims of Poza Tule are enclosed with a belt of dense reed vegetation, the plain bottom is covered with shallow water. This waterbody was reached after hard cutting through the bush in March, 2002.

Geophysical investigations showed that below the shallow pool is located travertine layer with thickness fluctuating from less than 2 m to more than 4 m. Below this travertine lid is up to 45 m deep water-filled void. Below it there is the next travertine lid – second cap!

Such sealed voids full with thermal water may serve as ideal isolated habitats for anoxic bacteria from the previous ice age periods.


  1. Marcus Gary, Poza Tule, Sistema Zacatón, research homepage. Accessed on June 27, 2010
Poza Tule, Sistema Zacaton on the map
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Location, GPS coordinates:23.0008 N 98.1636 W
Categories:Sinkholes, Ecosystems, Lakes and streams
Values:Geology, Biology, Unexplained
Rating:2 out of 10 stars
Where is located?North America, Mexico, Tamaulipas, southern part of the state, 13 km north-west from Aldama town
Depth:2 – 4 m, below one more void deeper than 45 m

Landmarks of Mexico

El Castillo pyramid, Chichen Itza
El Castillo pyramid, Chichen Itza / , Flickr / CC BY 2.0
Few countries of the world can offer such array of unique and astounding attractions as Mexico.

Area of this country was cradle of several highly developed indigenous civilizations and some regions in the country are dotted with remnants of ancient cities with temples, palaces and pyramids.


World's deepest sinkhole - Xiaozhai tiankeng, with tourist route visible
World’s deepest sinkhole – Xiaozhai tiankeng, with tourist route visible / Brookqi, Wikimedia Commons, public domain
Category includes outstanding sinkholes – large natural depressions or holes, which for most part represent collapsed caves.

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Hypogene Karst Regions and Caves of the World

This book illustrates the diversity of hypogene speleogenetic processes and void-conduit patterns depending on variations of the geological environments by presenting regional and cave-specific case studies. The cases include both well-known and newly recognized hypogene karst regions and caves of the world. They all focus on geological, hydrogeological, geodynamical and evolutionary contexts of hypogene speleogenesis.

Encyclopedia of Caves and Karst Science

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