Uxmal is unusual compared to other Mayan cities in that there is no source of water. Most Mayans cities have cenotes which is the name for an underground river that emerges to the surface.
Since they had no source of water, the Uxmal Mayans became expert at collecting and storing rain water. Over 160 cisterns have been found in the nucleus alone of Uxmal. The brochure you receive when you arrive also tells us that each cistern (or chultune) held 20 to 35 thousand litres.
Many water cisterns still exist at the site -- actually if you wander off the beaten path, you have to be careful not to walk into one.
There is no written history of the Mayans, and as such, nobody knows why Uxmal was abandoned in the 11th or 12th century, but one theory (that we heard in the light and sound show) was that even with all their cisterns, Uxmal could not survive one particularily long drought, so the residents moved elsewhere. Chaac was the Rain God -- that is why there are so many Chaac images on all the buildings.
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