The Mexican flag in Tijuana can be seen prominently from the U.S. side of the border. Tijuana is the sixth-largest metropolitan area in Mexico with a population of 1.5 million. By comparison, San Diego County has about 3 million people.

Photo by Julien Pearce / KPBS

Above: The Mexican flag in Tijuana can be seen prominently from the U.S. side of the border. Tijuana is the sixth-largest metropolitan area in Mexico with a population of 1.5 million. By comparison, San Diego County has about 3 million people.

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