Boundary marker

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A slate boundary stone on Maesglase
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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.

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.

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.