The international border between Mexico and the United States runs from San Diego , California , and Tijuana , Baja California , in the west to Matamoros , Tamaulipas , and Brownsville , Texas , in the east. It traverses a variety of terrains, ranging from major urban areas to inhospitable deserts. From the border crossing at El Paso , Texas , and Ciudad Ju�rez , Chihuahua , to the east, it follows the course of the Rio Grande (R�o Bravo del Norte) to the Gulf of Mexico ; from the same binational conurbation westward to the Pacific Ocean , it crosses vast tracts of the Sonoran and Chihuahuan Deserts , the Colorado River Delta , and the northernmost tip of the Baja California Peninsula .
The border's total length is 1,951 miles (3,141 km ), according to figures given by the International Boundary and Water Commission .[1] It is the most frequently crossed international border in the world, with some 350 million people crossing (legally) every year.[