CENOTE CHIKIN HA
Chikin Ha means "Western Water" and this cave system is just upstream of Sistema Ponderosa.
Chikin Ha is located 10 minutes south of Puerto Aventuras on Highway 307 very close to the entrance of Kantun Chi. From the turnoff a very good 3km/2mile dirt road leads out to the car parking area 10 minutes into the jungle.
If you continue on the path past Xtabay you will come to Chikin Ha. Chikin Ha is a very large half moon cenote with a massive undercut ceiling and crystal clear water.
The permanent guideline begins in the open water of Chikin Ha and traverses over to Cenote Arcoiris (Cenote Rainbow) through a large halocline tunnel. At Arcoiris the line runs along the edge of the cenote giving you a great view of the calcite rafting and large breakdown formations. The permanent line then returns back to Chikin Ha on the opposite side of the halocline tunnel as you go over and around massive breakdown piles decorated with fossils, crystal formations and speleothems. The line ends up at the far end of the cenote from where you entered and you can either make your exit here or swim back to the original entry point on the surface while admiring the many colorful birds that live in and around the cenote.
Look out for the Mayan cenote bird, the Motmot, with its distinctive call, iridescent turquoise plumage, and racquet tail feathers.