Photography: Mexico

Zacaton is a massive thermal sinkhole. Floating islands have formed on the surface and the jungle creeps inward.

Caracol is another sinkhole in the Systema Zacaton. Despite being one of the smallest cenotes in the system, it is thought to be the most biologically diverse.

A typical Mexican palm tree. This was taken in late winter, just before they start blooming.

A distant mountain peaks through the dense jungle.

This river is east of Systema Zacatone. This view is near the Gulf of Mexico, in the resort El Paraiso.