Boundary Marker Stone is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 14 August 1995. Boundary marker stone.
Boundary Marker Stone
- WRENN ID
- frozen-remnant-harvest
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 14 August 1995
- Type
- Boundary marker stone
- Address
- Boundary Marker Stone, Mynydd Troed, Llangors, Powys
- OS grid reference
- SO 160 295
- Coordinates
- 51.95843, -3.22357
- Source
- Cadw listing
Description
This is a boundary marker stone located between the parishes of Talgarth and Llangors. It is made of fissile sandstone and stands approximately 60 cm high with a rounded top. The stone is inscribed with "Mrs /[Macnamara] / 1821," although the inscription is scaling. Originally, there were two boundary stones on routes from Cwmdu before the Act of Consolidation of 1830, which unified the county turnpikes into one trust.
Local climate
Boundary Marker Stone sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 82% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 68% of listed buildings.
It experiences an average of 52 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 29 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
More on this building
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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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- 3 Boundary Stone on West Side of Track at SW 719 409
- 4 Boundary Stone on North Side of Track at SW 718 408
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