of the most important in Mexico with a total river length of approximately 766 km, draining an area of 7940 km2, with an average flow of about forty million cubic meters.

In addition to the Grijalva, there are other flows of water in the area in and around the canyon, many of which are seasonal. These consist of streams, some of which form waterfalls on the canyon's sides, and underground movements which have created caves and karst formations. The last important water formation in the area is the manmade