page_title: San Diego–Tijuana
section_title: Transportation
hierarchical_section_title: San Diego–Tijuana / Transportation
caption_attribution_description: English: Looking towards Tijuana from South San Diego; New City Residential Pictured
context_page_description: San Diego–Tijuana is an international transborder agglomeration, straddling the border of the adjacent North American coastal cities of San Diego, California, United States and Tijuana, Baja California, Mexico. The 2012 population of the region was 4,922,723, making it the largest bi-national conurbation shared between the United States and Mexico, the third-largest shared between the US and another country, and the fourth-largest in the world. In its entirety, the region consists of San Diego County in the United States and the municipalities of Tijuana, Rosarito Beach, and Tecate in Mexico. It is the third most populous region in the California–Baja California region, smaller only than the metropolitan areas of Greater Los Angeles and the San Francisco Bay Area.
  The largest centers of the urban area maintain global city status and as a whole the metropolitan region is host to 13 consulates from Asian, European, North American, Oceanian, and South American nations. Over fifty million people cross the border each year between Tijuana and San Diego, giving the region the busiest land-border crossing in the world.
caption: San Diego traffic at the San Ysidro Port of Entry, the busiest international border crossing in the world
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