Boundary

A line or an object indicating the limit of a tract of land, an estate, or a state, country or territory; a line, or connected series of lines going around a tract of land, etc., and inclosing it on all sides. A boundary may be marked by natural objects, or by artificial objects, or by an imaginary line drawn from one such object to another, or by these things in any combination. Artificial boundary: an object erected by man, to designate a limit, as a wall, fence or post. Natural boundary: a natural object, left where nature placed it, as a lake, or stream, or tree.