The cenotes caves in the Yucatan peninsula, Mexico.
The cenotes are sinkholes or potholes or sinkholes collapse, filled with a layer of fresh water and sometimes a bottom layer of sea water if they communicate with the ocean by faults. They are found mainly in North America and Central America, and especially in the Yucatan Peninsula in Mexico. They act as natural sinks that can reach several tens of meters. The cenotes are produced by a process of dissolution and collapse of limestone located above an underground network of caves and rivers. They are found both in picturesque places in the jungle and in cities (Valladolid).
The Mayans believed these wells as a means of communication with the gods of the infra-world, the gap representing a mouth. They were used as fresh water supply, but also as a place of worship in which offerings or sacrificial victims were thrown. The remnants of this cultural heritage are important historical and scientific value.