A few miles from Progreso, Yucatán, is the fishing village of Chicxulub (CHEEK-shoe-lube) which was the site of one of the great catastrophes in the life of the earth. Some 65 million years ago, an asteroid that was nine miles (fifteen kilometers) across slammed into Chicxulub at the speed of 44,640 mph (or 20 km/second) and destroyed some three quarters of all the life on earth, including all the dinosaurs. The impact was equivalent to a million times larger than the largest hydrogen bomb explosion and created a crater that was sixty miles (100 km) across and eighteen miles (30 km) deep.
Of course, that was millions of years ago, and the geology of the area has changed significantly.
Today, the Yucatán Peninsula is a large limestone chunk that has been raised up, but with numerous underground rivers and caves admitting access to the water beneath. What you will not find there a river. This did not make it easy for the ancient Maya to grow crops—except in their areas where cenotes prevail. The dark green aresa beneath the ring of cenotes is where the Puuc Hills are located, which rise to an elevation of several hundred feet. There, the Maya dug cisterns, called chultunes, which frequently run dry during periods of drought.
I hope to visit Chicxulub Puerto when I stay in Merida or Progreso.