A thin trail parts the jungle and sunlight slices into a circular hole in the limestone — the first cenote hangs like a cool, green pool beneath a curtain of roots. At Casa Tortuga Park, four distinct sinkholes wait within walking distance of one another: a semi-open cavern with stalactites, a bat-frequented grotto, a wide open jade-green channel, and a bell-shaped cave with ancient rock formations. The guide moves groups steadily, pointing out fossils, root systems that reach into the water, and the stone geometry that tells a story of collapsed karst above an extensive underground aquifer.