Fundamental Benchmark Details & GPS Waypoint

Twyn Carn Celyn 416m (1365ft)

Summit Feature: Name taken from OS draft surveyors map. Also recorded on OS maps as Mynydd Pen-y-graig and Mynydd Carn Celyn.
Classification: Hill Trigpoint, Pedwar, P30 Tump.
OS Grid Ref: SS986905 (10 figure Grid Ref: SS9860090500).
The original GR data for this hill was only accurate to a 6 figure grid reference (c.a 100m).
We have used additional user / trigpoint data to bring it up to 10 figures.

UK Area: 32 - Neath to Chepstow (OS Maps 1:50k 170. 1:25k 166W.)
Latitude: 51.604182, Longitude: -3.465569, Height: 416 metres (1365 feet)
Prominence: 33 metres (108 feet)
Unique Waypoint POI Name: 0416.- (DoBIH Hill ID: 15635)

Associated Trigpoint:
  TP6055 'Twyn Carn-Glen' Grid Ref: SS9863690591 Separation: 98m from Hill grid ref.

External Links for Twyn Carn Celyn:
-GeoHack link... -OS Map Bing link... -Google Map link... -Geograph link... -Twyn Carn Celyn on -Twyn Carn-Glen on

Data courtesy of Myrddyn Phillips and Aled Williams

Selected mapping: Google or Bing / Ordnance Survey

:Fundamental Benchmark | :Nearby Hill | :Nearby Trigpoint | : mouseover

Mynydd Pen-y-graig List & GPS Waypoints:

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  • '0416.-' SS986905 Twyn Carn Celyn (416m, p33)

Member's Comments on Twyn Carn Celyn...

Member's Grid References for Twyn Carn Celyn...

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Twyn Carn Celyn has been climbed by...

Adrian Anton Areluctant-triggeR Carole jonglew rhw underhill


Total = 1 Fundamental Benchmark
* The waypoint data in italics is only accurate to a 6 fig grid reference. Click here to learn how to help improve it.
Data courtesy of Myrddyn Phillips and Aled Williams


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