The frontier line divides the Pushtan tribal area, which Afghanistan claims.

By 1890, isolated bodies of settlement had broken into the unsettled area to the extent that there was hardly a frontier line.

The military forces of the two countries shall remain in their new positions until the definitive demarcation of the frontier line.

By this treaty the modern Turkey-Iran and Iraq-Iran frontier lines were drawn.

From my front line here, it's a no-man's-land until their frontier line.

Then tell me what I seek: What marks the frontier line?

What marks the frontier line?

There is a surer way To mark the frontier line.

By neither stream nor well We mark the frontier line.

In 1890, the frontier line was no more, though the frontier still existed in disconnected locations.