Cenote, from the maya archaic tzonoot (possible alternative Xenote handwriting), is the name given to a type of cave with fresh water. Currently, the term is also used to describe similar karst phenomena in other nations such as Australia, where they are simply called sinkholes and contain deep freshwater lakes with crystal clearness that attract speleosub from around the world. Cenote formation is traced back to low-level marine levels during pleistocene glaciations. They represent partially or totally collapsed karst caves. Cenote at the mature stage are similar to small circular lakes or lagoons with waterfall at the margins. In some cases, the cenotes break into the ocean. In this case there is a mixture of fresh and salted water, and you can observe a cloudy layer that represents the alocine. This phenomenon can be many kilometers inland, usually at a depth of 20-30 meters. Cenote Park, located in Playa del Carmen, Quintana Roo, Mexico, contains many cenote. These give access to a wide system of flooded caves such as the Nohoch Nah Chich cave. Caves like the Dos Ojos are a destination for speleosubs and organized searches to explore the underground system.