Wikipedia
A boundary marker, border marker, boundary stone, or border stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in direction of a boundary. There are several other types of named border markers, known as pillars, obelisks, and corners. Border markers can also be markers through which a border line runs in a straight line to determine that border. They can also be the markers from which a border marker has been fixed.
Usage examples of "boundary marker".
They walked back to the ravine's edge and stared at the pile of stone that formed the other boundary marker.
Maybe ground level provides us with a kind of symbolic boundary marker, an artificial construct that helps us remember that we are alive.
He was so lost in his own thoughts that he almost missed the boundary marker, the blaze that marked the end of his patrol range and the beginning of Dawnfire's.
This was the outermost boundary marker that Roger had established, the first of a series of three such marked trees that would point toward the site at which he had concealed the bulky radio transmitter.
He'd recognised a wind-eroded sphinx that had been set up as a boundary marker.
This isn't just the boundary marker between useful and useless water level data, thought Kemal.
As the last of us left the UMS environs, stepping over a'dimly lighted boundary marker into a wider and even older tunnel, we clasped hands on shoulders and half-marched, half-danced in lockstep.
Though the natural boundary marker was still a day's march away, the mere sight of it spurred on the safari.
In all likelihood, the Earl's Cross - a stone pillar in that open field - is a boundary marker, but it has the coat of arms of the Earls of Sutherland on one side and that of the town of Dornoch on the other side.