A witness tree (also known as a line tree) is a living tree located directly on a property boundary line that has been marked by a surveyor to identify the location of that boundary. Historically, surveyors used trees as natural landmarks when establishing property lines, particularly in heavily wooded areas where permanent monuments were difficult to install or locate. Surveyors often marked these trees by removing a section of bark, a practice known as blazing, or by carving notches, letters, or other identifying marks into the trunk. These markings helped future surveyors and property owners recognize the boundary’s location. A related term, witness tree, generally refers to a tree located near a property corner or survey monument that serves as a reference point for locating that corner, rather than necessarily standing directly on the boundary itself.
Line trees and witness trees played an important role in early American land surveying, particularly in the original surveys of public lands and rural properties. Surveyors frequently recorded the species, diameter, direction, and distance of witness trees in their field notes, creating a record that could be used to relocate property corners if physical monuments were lost or disturbed. Although trees can survive for generations, they are not entirely permanent markers because they may die, fall, be removed, or grow over their original markings. Nevertheless, surviving line trees and witness trees can provide valuable historical evidence in modern boundary surveys and property disputes. Surveyors may examine old scars, embedded markings, and historical survey records to determine whether a particular tree was used as an original boundary reference.
