Grijalva River
The territory of Mexico roughly corresponds with that of Mesoamerica, which was one of the cradles of plant domestication. Archeological research in the Gulf coast of Tabasco shows the earliest evidence of corn cultivation in Mexico. The first fields were along the Grijalva River delta with fossilized pollen evidence showing forest clearing around 5100 BCE. The domestication of corn is followed by that of sunflower seeds and cotton.