Pembrey Forest (SN 393 016) - Pellennig deletion
There has been a deletion of a hill from the list of
Y Pellennig – The Remotest Hills of Wales,
due to analysis of LIDAR data by Aled Williams.
The criteria for qualification as a Pellennig
is any hill in Wales whose summit is at least 2.5km from the nearest paved
public road and the hill having a minimum drop of 15m. The list of Y Pellennig – The Remotest Hills of Wales is available as a
downloadable e-booklet or print-booklet version on Mapping Mountains Publications with the up-to-date master list available on the Mapping Mountains site.
The hill is situated in the west south-western
part of the Mynydd Sylen group of hills and as its name suggests; it is a part
of a relatively large area of land comprising almost 2,500 acres of woodland whose
south-western boundary borders sand dunes with the sea beyond. Its Cardinal Hill is Mynydd Sylen (SN 515
080) and it is placed in the Region of South Wales (C-1). The hill and conifer plantation is named the
Pembrey Forest and it is situated with the community of Pen-bre and the town of
Porth Tywyn (Burry Port) to its east south-east.
The hill can be accessed from one of the main forest
tracks that emerge out of the Pembrey Country Park to its south-east, or from a
public footpath to its north that forms a part of the Wales Coastal Path.
The name of the hill is Pembrey Forest and it was
listed as a Pellennig with 2.560km
distance between its summit and the nearest paved public road and with c 18m of
drop. The previously listed summit is
positioned at SN 390 021, this position is to one of five 25m ring contours
that are shown on the Ordnance Survey 1:25,000 Explorer map, and importantly
this ring contour is the furthest from any paved public road.
The deletion of Pembrey Forest from the listing of
Pellennig hills is due to analysis of
LIDAR data by Aled Williams. LIDAR (Light Detection
& Ranging) is highly accurate height data that is now freely available for
much of England and Wales.
Aled’s analysis of LIDAR data to the highest
natural ground within the forest gives the hill the following details:
Pembrey
Forest
Summit
Height: 27.1m
Summit
Grid Reference: SN 39390 01694
Bwlch
Height: 9.5m
Bwlch
Grid Reference: SN 38702 02181
Drop: 17.6m
Remoteness: 2.360km from SN 41696 02197 (does not qualify
on distance)
The bwlch position given above connects this hill to the Pembrey Forest Ski Slope, which is given a much larger 25m ring contour and also a 30m ring contour; although in all probability the summit has been altered during the building of the ski slope. The critical bwlch for whichever high point is taken is positioned at SN 409 019 and is c 7m high.
The summit
previously listed in the Y Pellennig
list is to the north of the details to the hill given above, and its LIDAR data
came to:
24.8m
at SN 38984 02162
However,
there is a higher summit in the vicinity of the old Pellennig summit and this hill’s details was also analysed with
LIDAR data, these are given below:
Pembrey
Forest
Summit
Height: 25.7m
Summit
Grid Reference: SN 39118 02003
Bwlch
Height: 13.4m
Bwlch
Grid Reference: SN 39288 01922
Drop:
12.3m (does not qualify on drop)
Aled’s analysis of LIDAR
data gave the hill a 27.1m summit height at SN 39390 01694, and a 9.5m bwlch
height at SN 38702 02181 (bwlch position connecting to probable artificial
summit of ski slope), these values give this hill 17.6m of drop, and a 2.360km
distance from the nearest paved public road which is insufficient for it to
retain its Pellennig status.
This now brings the overall total for Y Pellennig to 168 hills for the Complete list (All Wales), with
the total for the Mainland Wales list being 124 hills. The Master List will be duly updated on the
Mapping Mountains site.
The full details for the hill are:
Cardinal Hill: Mynydd
Sylen
Summit Height: 27.1m
(LIDAR data)
Name: Pembrey Forest
OS 1:50,000 map: 159
Summit Grid Reference:
SN 39390 01694
Drop: 17.6m (LIDAR
data)
Distance: 2.360km
The list of additions and deletions in the Pellennig list since the 1st
edition of Y Pellennig – The Remotest
Hills of Wales
was published by Europeaklist (1st edition, April 2015) is as
follows:
ADDITIONS
DELETIONS
Pembrey Forest (SN 393 016)
Y Pellennig – The Remotest
Hills of Wales is now published by Mapping Mountains Publications (2nd edition, July 2016).
Myrddyn Phillips and Aled Williams (January 2017)
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