The Bajío (lowlands) is a region of Central Mexico that includes the plains south of the Sierra de Guanajuato, in the state of Guanajuato, as well as parts of the states of Querétaro (the Valley of Querétaro), Aguascalientes, Jalisco and Michoacán (particularly the area around Zamora).

In general parlance, it is usually associated with the States of Guanajuato and Querétaro, although it only forms a part of them. It is characterized by its highly mechanized agriculture, with mean precipitation in the order of 700 millimetres (28 in) per annum (one of the highest in the country). During the Viceroyalty of New Spain, the area was known as the breadbasket of the territory. Up until today (21st Century's second decade), the region produces sorghum, wheat and maize as its main crops.

The Bajío is known for being one of the most conservative bastions of Mexican Catholicism. The Bajío is where in April 1915, during the Mexican Revolution, General Álvaro Obregón provoked decisive battles against Pancho Villa. Villa's troops lost in June outside Celaya.

Read more about Bajío:  Pre-historic Bajío Culture

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Plazuelas - Background - Bajio Tradition
... Data from historical documents indicated that the prehispanic Bajio inhabitants were only Chichimeca, nomadic groups with appropriation economies and belligerents ... By 1972, Beatriz Braniff began to explain the Bajio cultures and proposed the contours of a "marginal" region of Mesoamerica, located on the edges of the high cultured regions The apparent influence of large Mesoamerican cities, mainly Teotihuacan in regional development, also departed from the academic debate the possibility of identifying and explaining the specific role played by local societies in the Mesoamerican development ...
Pre-historic Bajío Culture
... Recent archaeological studies of the Bajío have discovered an extensive, pre-historic cultural tradition unique to the region, particularly along the flood plains of the Lerma ... The Bajío Culture flourished from 300 to 650CE, with cultural centers ranging from El Cóporo in the far north of Guanajuato to Plazuelas in the far south west ...