The Mexico–United States border is an international boundary running from Tijuana, Baja California, and Imperial Beach, California, in the west to Matamoros, Tamaulipas, and Brownsville, Texas, in the east.
The United States of America, commonly referred to as the United States or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
Tijuana is the largest city in Baja California and on the Baja California Peninsula and center of the Tijuana metropolitan area, part of the international San Diego–Tijuana metropolitan area.
Tamaulipas, officially the Free and Sovereign State of Tamaulipas, is one of the 31 states which, with Mexico City, comprise the 32 Federal Entities of Mexico.
Why Walls Won't Secure The U.S.–Mexico Border by AJ+
This border, separating Mexico and the United States from each other, traverses a variety of terrains, ranging from major urban areas to uninhabitable deserts.
Mexico Border Crisis: National Guard Deployed to Texas Border by ABC News
It is the most frequently crossed controlled international boundary in the world, with approximately 350 million legal crossings being made annually.
From the Gulf of Mexico, it follows the course of the Rio Grande to the border crossing at Ciudad Juárez, Chihuahua and El Paso, Texas; westward from that binational conurbation it crosses vast tracts of the Chihuahuan and Sonoran Deserts to the Colorado River Delta, westward to the binational conurbation of San Diego, California, and Tijuana, Baja California, before reaching the Pacific Ocean.
A conurbation is a region comprising a number of cities, large towns, and other urban areas that, through population growth and physical expansion, have merged to form one continuous urban or industrially developed area.
San Diego is a major city in California, in San Diego County, on the coast of the Pacific Ocean in Southern California, approximately 120 miles south of Los Angeles and immediately adjacent to the border with Mexico.
The Sonoran Desert is a North American desert which covers large parts of the Southwestern United States in Arizona and California, and of Northwestern Mexico in Sonora, Baja California and Baja California Sur.