What is an example of an artificial monument?

An artificial monument refers to a man-made structure or object that is used to mark a boundary or a significant location. Fences are a clear example of this, as they are constructed for various purposes, including defining property lines, containing livestock, or providing security.

In contrast, other options like rocks, mountains, and rivers are natural features. While they can also serve as markers in some contexts – particularly in the case of boundaries – they are not created by human action. Therefore, fences distinctly categorize as artificial monuments since they are explicitly built to fulfill a designated role in demarcation and land use.