7Mexico – United States
One of the busiest borders in the world, the line between Mexico and the United States is also one of the most complex. While many crossings are orderly and safe, certain remote areas have seen issues related to smuggling, illegal crossings, and organized crime.
The border stretches across deserts, rivers, and cities, and conditions vary widely depending on location. Security is tight in many sections, especially in isolated desert regions where the environment itself can be dangerous.
