Underwater River in Mexico (Cenote Angelita). Underneath the water of Cenote Angelita is another flowing body of water. The river is full of hydrogen sulfate, which is much heavier than normal salt water. When it sinks to the bottom, it forms a flow of it
Riviera Maya, Mexico - With their stalactites and stalagmites, and pools of water shining an unearthly blue, Riviera Maya cenotes look like wondrous underground cathedrals. You can swim and snorkel inside many!
The Underground Paradise of Rio Secreto - Playa del Carmen, Mexico. Rio Secreto is a huge system of caves near to Playa del Carmen, Mexico. Over many many centuries an underground river of pure water has been carving out pure beauty beneath.