The international border between the United States and Mexico 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
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 Deserts, the
Colorado River Delta, and the northernmost tip of the
Baja California Peninsula before reaching the
Pacific Ocean.
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