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The Valley of Mexico is located in the Trans-Mexican Volcanic Belt. The valley contains most of the Mexico City Metropolitan Area, as well as parts of the State of Mexico, Hidalgo, Tlaxcala, and Puebla. The Basin of Mexico covers approximately 9600 km2 in the NNE-SSW direction with length to width dimensions of approximately 125 km to 75 km. The Valley of Mexico can be subdivided into four basins, but the largest and most-studied is the area that contains Mexico City. This section of the valley in particular is colloquially referred to as the "Valley of Mexico".