The Cenotes used to be coral reefs millions of years ago. Then there was a huge meteor that struck the Yucatan Peninsula. This caused vast destruction and also it blasted underground tunnels deep into the Mexican land. Several million years later an ice age covered the land and froze they oceans. The sheer weight of the ice collapsed the land in on itself into the underground tunnels. These formed openings, ways into the underground tunnel network that stretched for hundreds of miles. These openings are called the Cenotes.
When the ice age finished the ice melted and filled the tunnels amd openings with water. Over millions of years these tunnels and caves slowly filled up with fresh water filtered through the land. Stalagmites were formed as the rain filtered through the land and dripped through calcium deposits left from the coral reefs that formed. This has produced fabulous Stalagmites that you can find throughout the entire cave system.
The fresh water that flows from the cenotes flows into the sea, and sometimes mixes with the sea water. One of the reasons Bull Sharks can be found along the coast is they like the fresh water, they are the only species of fish that can also live in fresh water too. Really they are attracted to the fresh water because of the fish it brings with them.
The cenotes are, in my view, one of the seven wonders of the world. Truely stunning:
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