What are cenotes in Mexico?
Cenotes are limestone sinkholes, usually filled with fresh water, that were essential to the Maya civilization long before the Spanish arrived in the 1500s. To the Maya, they were sacred entrances to the underworld, known as Xibalba (“the place of fear”).
Mexico has an estimated 6,000 to 7,000 cenotes, but only a small number are open to visitors. They generally fall into four types: fully underground cave cenotes, semi-open cenotes with a partially collapsed roof, open cenotes that look like natural pools, and ancient cenotes filled with sediment.
Some cenotes hold remarkable archaeological finds. Divers have uncovered human remains dating back almost 14,000 years, along with the bones of a mastodon, which is a prehistoric relative of the elephant.
The Yucatán’s cenotes also have a deeper geological link. About 66 million years ago, the Chicxulub asteroid struck the peninsula and contributed to the extinction of the dinosaurs. The impact caused large areas of limestone bedrock to collapse, which created thousands of sinkholes.
Many of these cenotes form what is known as the “Ring of Cenotes,” which includes popular tourist sites such as those in the Xel-Há park near Tulum. Others are much less developed, with minimal facilities and fewer visitors.