How Long Is the Southern Border of the Us

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About 1,255 miles of that border follows the Rio Grande. That means if you’re in Texas, you can literally wade across the river (not recommended) and be in Mexico. The rest—about 699 miles—is a straight-ish line marked by fences, walls, and even giant obelisks that look like stone toothpicks.

But here’s the fun part: the border isn’t a solid line. There are gaps—massive gaps—where the desert just keeps going. You can walk across in some places without seeing a single fence. It’s like the universe forgot to put up a “You Are Now Leaving the USA” sign.

Map Of USA Southern Border - Printable US Maps

What About the Coastline? (You Knew I’d Ask)

Oh, you think we’re done? Nope. The actual “southern border” of the US also includes the coastal waters in the Pacific and the Gulf of Mexico. If you count those, the number balloons to about 2,000 miles of maritime boundary. But nobody uses that for casual conversation, unless you’re really into maritime law.

And let’s not forget the four US states that touch Mexico: California, Arizona, New Mexico, and Texas. Each has its own personality. California’s border is mostly fences and beaches; Arizona’s is all brutal desert; New Mexico’s is shockingly short (just 180 miles); and Texas? Texas owns nearly two-thirds of the whole thing.