three-mile limit

You have the right, as captain of a ship outside the three-mile limit, to marry folks in an emergency.

The Colleen was pretty well inshore then, and yet safe outside the three-mile limit in our judgment.

As a matter of fact, outside the three-mile limit, she practically owns the waters of the world.

Beyond the three-mile limit, the ocean becomes the "high seas," and is then open to anybody.

The water was as a general rule too deep outside the three-mile limit for legitimate fishing.