Craig Goodwin of Australia celebrates scoring his side's first goal during the FIFA World Cup Qatar 2022 Group D match between France and Australia at Al Janoub Stadium on November 22, 2022 in Al Wakrah, Qatar. (Photo by Kai Pfaffenbach/Reuters)

Mina Sue Choi (L) from South Korea reacts after winning the Miss Earth 2022 pageant during the coro​nation night in Manila, Philippines, 29 November 2022. (Photo by Francis R. Malasig/EPA/EFE)

Kylian Mbappe of France looks dejected on the bench after a penalty shoot out loss during the FIFA World Cup Qatar 2022 Final match between Argentina and France at Lusail Stadium on December 18, 2022 in Lusail City, Qatar. (Photo by Carl Recine/Reuters)

A South Korea fan smiles ahead of the Qatar 2022 World Cup Group H football match between Uruguay and South Korea at the Education City Stadium in Al-Rayyan, west of Doha on November 24, 2022. (Photo by Jewel Samad/AFP Photo)

Tom Nevins guts a feral pig sow during hunting on Silver Plains Station on October 8, 2011 outside of Coen, Australia. Feral pigs are recognised as environmental and agricultural pests reported to have a population of up to 23.5 million over around half of Australia. The Cooktown Hog Hunt is held annually with this year's hunting window open from registration at 2pm on Friday to the end of weigh in at 2pm on Sunday afternoon. (Photo by Mark Kolbe/Getty Images)

Emperor penguins gathered together to keep their chicks warm in these pictures. Marine scientist Frederique Oliver snapped the protective parents in Antarctica as they huddled against the huge winds.The adorable birds have to battle temperatures on -20 degrees Celsius as well as winds of up to 40 knots on the ice. (Photo by Frederique Oliver/Caters News)

A cenote is a natural phenomenon, a sinkhole in the Earth’s surface. The Yucatan Peninsula in Mexico has an estimated 7,000 cenotes because it is primarily made up of porous limestone. For millions of years, rainfall slowly ate away at the limestone and a huge system of underground caves and caverns was formed. Many filled with water from rain or from the underground water table. When the roof of a water filled cave collapses, a cenote is born. The water found in a cenote may be fresh water, salt water, or both. Structurally it may be completely open, like a lake, almost completely closed with just a small opening at the top, or somewhere in between.