Border checkpoint

Access-controlled borders often have a limited number of checkpoints where they can be crossed without legal sanctions.

Arrangements or treaties may be formed to allow or mandate less restrained crossings (e.g. the Schengen Agreement).

This is a list of the busiest land border checkpoints in the world, handling more than 35 million travelers in both directions annually.

Airports serving international passengers are effectively checkpoints, and have the proper customs, immigration and quarantine facilities.

[9] This is a list of the busiest seaports in the world, with proper customs, immigration and quarantine facilities to be deemed as maritime checkpoints.