Tag:historic=boundary_stone
 historic = boundary_stone
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A historic physical marker that identifies a boundary 
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| Group: historic |
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| Status: de facto |
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This defines a historical position of a 
boundary marker, boundary stone, or border stone. The recent boundary stone is marked with borderstone or borderpole or other markers.
A historic boundary stone is a robust (historic) 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 stones 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.
How to map
Set a node 
and add historic=boundary_stone. Historic boundary stones should always be mapped separately from any actual boundary relation, even if the boundary stone is located directly on the way of the boundary relation. The boundary stone node can be placed on top of a node or way of a boundary relation but should not be merged with it (as discussed in this forum topic).
Optional tags
name=*
inscription=* - inscriptions on different sides of the marker could be separated by a sign "/"
year=#### (year) (or documented tag start_date=*)
moved=yes - indicates that the marker is not on its original position
format=* - describes the shape of the marker
format:top=* - describes the shape of the marker's top
height=* - height of the marker
collection=yes - the marker is a part of the collection of historical markers
ref=* - the number written on the marker
old_ref=* - the (old, changed) number written on the marker
material=*
Similar tags
For so-called historic milestones look at
historic=milestone
For so-called modern milestones look at
boundary=marker
highway=milestone - Proposed features/Milestones
railway=milestone
waterway=milestone
See also
- Here you can find a JOSM template - User:Lübeck/JOSM Template Milestone BoundaryStone
- boundary=historic