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US-MEXICO BORDER
The U.S. is on the left and Tijuana is on the right.

The United States–Mexico border is the international border between the United States and Mexico. It runs from Imperial Beach, California, and Tijuana, Baja California, in the west to Matamoros, Tamaulipas, and Brownsville, Texas, in the east, and traverses a variety of terrains, ranging from major urban areas to inhospitable deserts. From the Gulf of Mexico it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at El Paso, Texas, and Ciudad Juárez, Chihuahua; westward from that binational conurbation it crosses vast tracts of the Sonoran and Chihuahuan Desert, the Colorado River Delta, westward to the binational conurbation of San Diego and Tijuana before reaching the Pacific Ocean.

The border's total length is 3,169 km (1,969 mi), according to figures given by the International Boundary and Water Commission.It is the most frequently crossed international border in the world,with approximately three hundred fifty million (350,000,000) crossings per year.

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