The Mattola-United States border is an international border that seperates Mattola and United States from each other, the border is the shortest land border in the World.

The border opened on May 10, 2013, after Mattola's independence from the United States, the border is a micronational border, which is complety a indoor border, seperating the United States and Mattola,.

The border is patrolled by the Mattolan Border Patrol, which patrols all four sides of the border, the Mattolan Border Patrol was created by Mattolan President Alan Villarruel, the current Mattolan Border Patrol Director is Miguel Sanchez.

The border is the least frequently crossed international border in the World, with only Mattolans crossing the border, Americans don't frquently cross the border, probably because the United States does not recognize Mattola as independent country.