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Geography

The Central Valleys of Oaxaca, the cradle of Zapotec civilization, are three broad valleys—Etla in the west, Ocotlán in the south and Mitla in the east—that join at an altitude of about 4500 feet above sea level in the center of what today is the state of Oaxaca. They are located about 200 km south of Mexico City. Mountains surround the valley with The Sierra Norte in the north and the mountains of Tlacolula in the southeast. The environment is well suited for agriculture and is considered one of the cradles of maize. It is estimated that at the time of the emergence of Zapotec civilization, the valley soil were unaffected by the erosion seen today, as the oak and pine forests covering the surrounding mountains had not yet been decimated by logging. There is a dry season from November until May but along the rivers it is possible to plant and harvest crops twice. The mountains are traversed from north-west to south by the Atoyac River which provides water for a small strip of land bordering the river, when it periodically floods. To provide water for crops elsewhere in the valley away from the river, the Zapotecs used canal irrigation. By using water from small streams, the Zapotecs were able to bring water to Monte Albán, situated 400 meters above the valley floor. Archaeologists found remains of a small irrigation system consisting of a dam and a canal on the south-eastern flank of the mountain. As this would not have been enough to support all the population of Monte Albán, it is assumed that there were many other irrigation systems. Likewise, crops grown in the valley were not enough to sustain the rapid population growth in the Monte Albán I phase. Therefore, crops were grown on the foothills where the soil is a less fertile and artificial irrigation was needed.

Innovation of farming enabled the Zapotec to pay tribute to the Spanish conquerors and create enough surplus to feed themselves despite natural disasters and disease.