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Triangulation Pillar S2386: Llangain 
Rebuilt as FB 11156.
Location
Grid reference: SN 38554 16355.
Landranger 159: Swansea & Gower, Carmarthen.
Waypoint: T16571.
Neighbouring Triangulation Pillars
The nearest fundamental bench mark is Carmarthen,
8.86km to the northeast.
Third Geodetic Levelling, England & Wales (1950-68)
This triangulation pillar was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line.
Location
Grid reference: SN 38554 16355.
Landranger 159: Swansea & Gower, Carmarthen.
Waypoint: T16571.
Neighbouring Triangulation Pillars
| 11156 | Llangain 0.00m to the east. |
| S2370 | Moelfre 2.99km to the west. |
| S2394 | Lan 3.85km to the southeast. |
| S2373 | Llandefeilog 4.29km to the south. |
| S2372 | Bolahaul 4.45km to the northeast. |
Third Geodetic Levelling, England & Wales (1950-68)
This triangulation pillar was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line.