Cenotes are natural sinkholes or wells that are filled with water, commonly found in the Yucatán Peninsula of Mexico. They are formed when limestone bedrock erodes, creating openings that expose groundwater. Cenotes can be open-air pools, partially covered, or completely underground, and they vary in size and depth. These unique geological formations are significant to the Maya civilization, as they provided a vital source of fresh water. Many cenotes were also considered sacred and used for rituals. Today, cenotes attract tourists for swimming, snorkeling, and diving, offering a glimpse into the region's natural beauty and cultural history.