Oakland Athletics left fielder Tony Kemp (5) catches the ball during the first inning against the Miami Marlins at RingCentral Coliseum in Oakland, California on August 22, 2022. (Photo by Stan Szeto/USA TODAY Sports)

Marcus Semien #2 of the Texas Rangers is doused with sports drink after the game against the Seattle Mariners at Globe Life Field on June 03, 2023 in Arlington, Texas. (Photo by Sam Hodde/Getty Images)

SKY SPORTS presenter Anna Woolhouse has stunned in a glamorous outfit ahead of Saturday's World Darts Championship action at Alexandra Palace in London in the last decade of December 2024. (Photo by @woolyanna1/Instagram)

A Kashmiri Muslim woman balances on a water pipe before collecting water at Dasilpora village on March 22, 2018. World Water Day is held annually on 22 March as a means of focusing attention on the importance of freshwater and advocating for the sustainable management of freshwater resources. (Photo by Tauseef Mustafa/AFP Photo)

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.

Pedestrians walk past a truck with a giant Soviet Red Army hat seen on it, an installation created by Russian artist Vasily Slonov, during the annual “Winter Virage” motor sports festival dedicated to the Defender of the Fatherland Day on the embankment of the Yenisei River in Russia's Siberian city of Krasnoyarsk, February 23, 2015. (Photo by Ilya Naymushin/Reuters)