Garth Fawr (SO 082 059) – Pedwar addition
There has been an addition to the listing of Y Pedwarau due to detail on OS Maps,
which is the recent replacement for OS Get-a-map. The Y
Pedwarau is the title for the list of 400m hills of Wales and takes in all
Welsh hills at and above 400m and below 500m in height that have a minimum 30m
of drop, the list is a joint compilation between Myrddyn Phillips and Aled
Williams and it commenced publication on Mapping Mountains on the 30.01.17.
The name of the hill is Garth Fawr and prior to analysis
of contours on the OS Maps website this hill was not listed as it is a
relatively recent man-made construction and is the result of waste spoil from
the Ffos-y-fran opencast mine that is now considered solid and stable,
therefore it does not possess any separate ring contours for the area of its
summit on either the Ordnance Survey 1:50,000 Landranger or the 1:25,000
Explorer map.
Garth Fawr is situated in the Y Cymoedd –
dwyreiniol range of hills and is placed in the Region of South Wales (Region C,
Sub-Region C2). The hill is positioned
between the towns of Merthyr Tudful (Merthyr Tydfil) to its north-west and
Rhymni (Rhymney) to its north-east and has the A 465 Heads of the Valleys Road
to its north and the A 4060 road to its west.
As the summit of this hill is not a part of
designated open access land permission to visit should be sought, for those
wishing to do so a minor road to the south would give access to the hill.
Garth Fawr had little natural prominence and is a
southerly spur of Twyn y Waun, but due to mining activity its height has
increased with the 5m contour intervals on OS Maps giving it three separate
uppermost 410m ring contours and a bwlch height of c 376m based on contouring
between 375m – 380m, whilst LIDAR analysis conducted by Aled Williams gives the
summit height as 388.0m at SO 08521 05968 and the height of the bwlch as 374.8m
at SO 08618 06004. It is apparent that
the mine spoil was deposited after the measurement of LIDAR data was taken. Therefore, as the hill is considered solid
and stable these values are sufficient for it to be listed as a Pedwar with c 35m of drop.
The full details for the hill are:
Cardinal Hill: Twyn y
Waun
Summit Height: 410m
Name: Garth Fawr
OS 1:50,000 map: 160
Summit Grid Reference:
SO 082 059
Drop: c 35m
For the additions, deletions and reclassifications to the Y Pedwarau reported on Mapping Mountains
since the May 2013 publication of the list by Europeaklist please consult the
following Change Registers:
 |
| Garth Fawr (SO 082 059) is now classified as a Pedwar. Photo: Rob Woodall |
Myrddyn Phillips and Aled Williams (January 2018)
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