Tijuana, is the largest city of the Mexican state of Baja California, situated on the U.S.-Mexico border adjacent to its sister city of San Diego, California. Tijuana is the westernmost city in Mexico, however, the westernmost population center is located in Isla Guadalupe.

Currently, the Tijuana metropolitan area is the sixth-largest in Mexico, with a population of 1,483,992. The San Diego-Tijuana Metropolitan Area is the 14th largest metropolitan area in North America, at 4,922,723. It is one of the fastest growing cities in Mexico.

Recently the city has been the sight of intense fighting between rival crime groups that has resulted in dozens of deaths.