The Riviera Maya has the largest underground water system in the world.
Cenotes are systems of flooded caves formed by crystalline underground rivers typical of the region. In these fresh waters, you will find a great amount of biodiversity as well as stalactites, stalagmites, marine fossils, gas clouds (sulfuric acid) and haloclines (mix of salt water with fresh water), with a visibility of more than 50 meters.
Cenote The Pit has an upside down funnel shape and a depth of 90 meters, being one of the deepest in the region, you will stay at a maximum depth of 30 meters, from 12 to 18 meters where you can observe the Halocline (where fresh water meets salt water) and upon reaching 30 meters you will find a cloud of sulfur and hydrogen, where you will feel as if you were in the clouds, in Cenote The Pit fossils of more than 10 thousand years old have been found.
Cenote The Pit is a unique place, due to the way in which the light penetrates the cenote, reaching the cloud at a depth of 30 meters, illuminating the entire cavern and creating a play of lights in its interior and an unequaled sensation due to the immensity of this well of water.
Known by the Mayans as the gateway to Xibalba (the world of death), these two cenotes (The Pit and Dos Ojos) are located within the largest underground river system in the world with a length of 347 kilometers: Sac Actun - Dos Ojos System.
Cenote The Pit and Cenote Dos Ojos are one of the best dives to do in the Tulum and Playa del Carmen area.