One of comparatively large sinkholes in the unique Sistema Zacatón karst field is Poza Verde.

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 a double bottom

Poza Verde has a diameter of 120 – 150 m. It is hard to access – beautiful blue water is encircled by tall limestone cliffs.

Water in this lake is somewhat cooler than in neighboring cenotes – 28 – 29° C. Unlike to other sinkholes nearby, the water here is stratified, with chemocline. Surface water is not acidic. Thus Poza Verde seems to be more like a “normal lake”.

Depth of sinkhole is 40 – 48 m what is comparatively little if compared to neighboring sinkholes. There have been attempts without success to find any large side passages. Bottom of the sinkhole is extremely level.

This is explained by the fact that the bottom of sinkhole is several meters thick travertine lid formed at some earlier time when the water level was considerably lower. Below this lid, there is located another void filler with thermal water.


  1. Marcus Gary, Sistema Zacatón, research homepage. Accessed in the 23rd June 2010
Poza Verde, Sistema Zacaton on the map
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Location, GPS coordinates: 22.9934 N 98.1615 W
Categories: Sinkholes, Ecosystems, Lakes and streams
Values: Geology, Biology
Rating: 1.5 out of 10 stars
Where is located? North America, Mexico, Tamaulipas, southern part of the state, 12 km north-west from Aldama town
Alternate names: Cenote Verde
Depth: 48 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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