A landmark served as a property line or boundary. A landmark could not be removed without incurring the severe displeasure of God. To move a landmark was considered stealing from one’s neighbor – sinning against God.
o “Thou shalt not remove thy neighbour’s landmark, which they of old time have set in thine inheritance, which thou shalt inherit in the land that the Lord thy God giveth thee to possess it (Deut 19:14).