What is a monument or marker that designates land boundaries called?

The term that specifically describes a monument or marker that designates land boundaries is "Boundary Stone." This is a physical object often made of stone or metal, which is placed at a corner or a boundary of a property to denote the limits of that land. The historical significance of boundary stones is also notable, as they have been used for centuries to delineate property lines and can be found in various forms across different cultures.

Land boundaries play a crucial role in real estate, law, and land management, and the correct identification and marking of these boundaries can prevent disputes and clarify ownership. While landmark refers to a significant or historic feature that stands out in a landscape, it does not specifically pertain to boundary designation. Similarly, a marker post, although it can serve a similar purpose, typically refers to a less permanent structure used for indication rather than a definitive boundary marker. Thus, while these terms may have overlapping meanings in some contexts, "Boundary Stone" is the most precise choice for a monument that designates land boundaries.