|Tucson is Arizona's second largest city, and the seat of Pima County, with a metropolitan area population just under a million as of the 2006 Census Bureau estimate. Located 60 miles noth of the United States-Mexico border, the city sits on an alluvial plain in the Sonoran Desert along the Santa Cruz River, which is dry most of the year.|
Tucson's economy is based heavily on the University of Arizona located in the city, and the Davis-Monthan Air Force Base. Tourism is another major industry for the city.
Official Municipal Website: