A slate boundary stone on Maesglase

A boundary marker or boundary stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in a direction of a boundary. They have often been used to mark critical points on boundaries between countries or local administrations but have also been used to mark out the limits of private land-holdings especially in areas where fences or walls are impractical or unnecessary. Slate Slate is a fine-grained, homogeneous, metamorphic rock derived from an original sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism. ... Look up country in Wiktionary, the free dictionary. ... A fence is a freestanding structure designed to restrict or prevent movement across a boundary. ... WALL is an Radio station on AM 1340. ...

Boundary markers are often made of stone and are typically placed at a notable or especially visible point. Many are inscribed with relevant information such as the abbreviation of the boundary holder and often a date. Wiktionary has related dictionary definitions, such as: stone Stone may be used as a building material, as in this dry stone wall Stone may refer to: Rock (geology), a naturally occurring aggregate of minerals and/or mineraloids Stoning, a method of execution using rocks Gemstone, as used in jewelry Stone...

In developed countries examples of boundary markers may only be found in more remote locations where more modern means of identifying boundaries such as road margins or building lines have not yet appeared.