Cenotes

 Cenotes are natural sinkholes formed by the collapse of limestone bedrock, revealing the groundwater and natural springs beneath. Cenotes form through a process called karstification. That is when rainwater, which is slightly acidic, seeps into the ground and breaks down limestone. Large and deep cenotes form if a spot with limestone is already soft or broken down by the minerals from the water underneath.

These formations are normally found in the Yucatán Peninsula of Mexico and are renowned for their deep, crystal-clear waters. Cenote waters are deep because they expose cave water systems. Over the years, the minerals and sometimes even flowing water in the caves can make the cenotes so deep that the clear water turns pitch black when you look down. Some of the cavefish that live in cenotes are blind because they have adapted to the dark.

Cenotes have been significant to the Mayan civilization for centuries, serving both as sources of freshwater and as sacred sites for rituals and offerings. The Maya believed cenotes were gateways to the underworld, Xibalba, and often conducted sacred offerings and human sacrifices to please their gods, especially during times of drought, which were common. Archaeologists discovered human skeletons and artifacts found in cenotes like those at Chichen Itza, providing evidence of the sacrifices. The reverence for cenotes is also reflected in Maya art and architecture, with many temples and structures built near these sacred sites. For example, there are over 30 cenotes near Chichen Itza.

Unfortunately, some of these cenotes are in danger from climate change and tourism. Climate change poses significant threats to cenotes due to increased storm runoff affecting water levels and quality. This can harm the ecosystems within cenotes, disrupt habitats, and endanger rare cave species. Additionally, the popularity of these sites has led to littering and damage to the caves.