A small fence separates densely populated Tijuana, Mexico, right, from the United States in the Border Patrol€™s San Diego Sector. Construction is underway to extend a secondary fence over the top of this hill and eventually to the Pacific Ocean.

The United States–Mexico border is the international borderbetween the United States and Mexico. It runs from Imperial Beach, California, and Tijuana, Baja California, in the west toMatamoros, Tamaulipas, and Brownsville, Texas, in the east, and traverses a variety of terrains, ranging from major urban areas to inhospitable deserts. The border’s total length is 3,169 km. The U.S.–Mexico border has the second highest number of both legal and illegal crossings of any land border in the world, behind the Canada – United States border.



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