Nice sinkhole in the Riviera Maya, Puerto Morelos, Cenote Route. Located to the left of the road, just 12.2 Km from highway Cancun-Tulum. The natural wonders of the Riviera Maya are countless, but some of the most unique to the area are the cenotes. Cenotes are created by an underground river system and are fresh water sink holes that the Maya considered to be sacred. In addition they were an incredibly important resource as a fresh water source, and the Mayans also believed they were the entrance to the underworld.