Pozzo del Merro
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Pozzo del Merro is a flooded sinkhole in the countryside northeast of Rome, Italy. Situated at the bottom of an 80 m conical pit, at 392 m it is the second deepest underwater vertical cave in the worl
Pozzo del Merro sinkhole aerial view
Zacatón
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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
Pozzo del Merro
…advanced "Prometeo" robot reached the bottom at 392 m (1,286 ft), but discovered a narrow passage continuing horizontally. The sinkhole, similar to the Zacatón cenote, was formed by volcanic activity eroding the carbonate rock. The sinkhole is part of the natural reserve Macchia di Gattaceca e Macchia del Barco…
El Zacatón with free floating grass island (lower right), Municipality of Aldama, Tamaulipas, Mexico
Zacaton sinkhole, cross-section
Free floating grass islands in the cenote Zacaton (2010).
One of the many smaller cenotes, or sinkholes, in the Zacatón system the near Aldama, Tamaulipas (2013)