| Tucson, AZ |
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Founded in 1776 as a Spanish supply station for nearby Mission San Xavier del Bac. Today, Tucson is a city of over 300,000, the second-largest in Arizona. It is built on the banks of the Santa Cruz River, subterranean except in the rainy season. Tucson is located in a broad valley, surrounded by mountains; the Santa Catalinas on the north, the Rincons on the east, Santa Ritas on the south and the Tucsons on the west.