"The largest undefended border in the world will become a wall."

Uzbekistan slipped in between the two countries, which share the longest undefended border in the world.

That final is very likely to be popular on both sides of the longest undefended border in the world.

In a few more minutes he would have reached an important point in his journey: the longest undefended border in the world.

The longest undefended international border in the world.

Their 5,524-mile undefended border is crossed about 75 million times a year.

This longest undefended border in the world bisects individual lives as well as the Continent.

Canada shares the world's longest undefended border with the United States.

Canada and the U.S. share the longest undefended border in the world.

Crossing the world's longest undefended border is becoming more complicated.