The first list to the Welsh
200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this
list preceded the list of TuMPs by nine years, the list proved a very useful
resource for the TuMP compilation for this category of hill.
The Welsh 200m P30 list
documents all hills in Wales that are at or above 200m in height and are below
300m in height, to qualify for the main list each hill requires a minimum of
30m of prominence.
The hills listed below are
updates to the Welsh 200m P30 list originally published on Geoff Crowder's
website. To see the original list click {here}
The original published list had
a Sub-List which was entitled ‘Hills to Survey’. This list consisted of all hills in Wales in
the stipulated height band that have a minimum of 20m of prominence, but do not
meet the minimum 30m of prominence to enter the main list, according to
Ordnance Survey map spot heights and contours.
Nowadays the standard Sub-List takes in all hills that have a minimum of
20m of prominence. However, the Hills to
Survey Sub-List discounted hills whose map spot heights gave a drop value of
less than 30m, but more than 20m. By
doing so, the only hills that were Sub-Listed were those that map values
dictated stood a chance of entering the main list, for example; if a hill had a
summit spot height of 250m and a bwlch spot height of 221m, it was not listed
in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand
a chance of main list qualification.
When compiling the Sub-List I
was measuring many hills for P30 status using a basic levelling technique,
please click {here} for more information concerning this. I now know that Ordnance Survey spot heights
have a standard margin of uncertainty of + / - 3m associated with their
accuracy. Therefore many hills that were
not listed in the original Sub-List may have sufficient drop to enter the main
list. Because of this the Sub-List has
been altered to include all hills that have a minimum of 20m of drop but are
not known to attain the minimum 30m of drop to enter the main list.
The hills listed below are
those major amendments to the original Welsh 200m P30 list as it appears on
Geoff’s website. There are many hills
that have been promoted from the Hills to Survey Sub-List to the main list,
whilst there are many additions to the Sub-List now that it has been
standardised to include all 20m minimum but below 30m drop hills.
When the 200m P30 list was
first published it was the first to this category of hills and in some way it
and its other 100m height band lists paved the way for Clem’s data that later
appeared on the RHB file database and then for the TuMPs listing by Mark
Jackson.
As well as the first P30 list
to this height band the list is now the first to include a comprehensive
Sub-List.
TuMP baggers beware; as the
main list also includes P30’s not listed by Mark Jackson, so if you want to
visit all P30’s you’ll have to include some non TuMPs to do so.
The list will be updated on a
weekly basis and will be done so through each Group category, starting from the
north and working south. The Thirty
Second and last Group is Bryniau Cymoedd.
Bryniau
Cymoedd
North from the sea at ST
194 721 following the Afon Elái (Ely River) to ST 030 812, the Nant
Melyn towards bwlch at ST 007 830, the Ewenni Fach to SS
954 799, the Afon Ewenni (Ewenny River) to SS 878 767 and the Afon Ogwr (Ogmore
River) to the sea at SS 855 757, continuing east from the sea at SS 666 917
following the Afon Tawe to SN 723 036, the Upper Clydach River to bwlch at SN
698 094 and the Garnant to SN 686 133, continuing south of the Afon Aman (River
Amman) to bwlch at SN 739 135, the Afon Twrch to SN 771 083, the Afon Tawe to SN
834 127, the Nant Llech to bwlch at SN 844 107, the Afon Pyrddin to SN 898 091,
the Afon Nedd (River Neath) to SN 902 074 and the Afon Mellte to SN 910 079, continuing
south of the Sychryd and Camnant to bwlch at SN 942 062 and the Afon Cynon to
SN 988 046, and the Nant y Gwyddel to bwlch at SO 005 073 and following stream
to SO 030 076, the Taf Fawr to SO 046 062, the Nant Moriais to bwlch at SO 082
086, and bwlch at SO 119 101, and bwlch at SO 147 115, and bwlch at SO 174 115,
and bwlch at SO 192 115, and the River Clydach to SO 242 154, and the Afon Wysg
(River Usk) to the sea at ST 323 813.
Bordering with Y Mynydd Du, Fforest Fawr, Bannau Brycheiniog and Y
Mynyddoedd Duon to the north, Coed Gwent to the east, the sea and Bro Morgannwg
to the south and Penlle’rcastell to the west.
Twmpau - 200m updates
Pt.
245m 245m SN 721 059
This hill was originally listed
under the name of Cefn Llan, which had been taken from buildings to the west of
the summit, as the blog author does not know an appropriate name for the hill
it is reverting to the Pt. notation. The
summit height is taken from a 245m trig pillar, and the bwlch height is taken
from a 214m spot height that appears on the Ordnance Survey enlarged Geograph
map. These values give this hill 31m of
drop and therefore the hill is promoted from the Sub-List.
Sub-Twmpau - 200m updates
Pt.
209m 209m SN 714 013
The Pt notation is being used
for the name of this hill as it seems two names that appear near to this hill’s
summit on the map; Graig Ola and Craig-y-perchyll may be applicable to
buildings and not the hill. This is a
another hill that benefits from the Ordnance Survey enlarged Geograph map, as
the bwlch has a 184m spot height on it on this map, and with a summit spot
height of 209m, this hill enters the Sub-List with 25m of drop.
Mynydd
Portref 277m SS 993 856
This hill has a summit spot
height of 277m and bwlch contouring between c 250m – c 255m, with the height of
the bwlch estimated as c 252m, giving this hill c 25m of drop.
Pt.
c 241m c 241m ST 166 968
The summit of this hill is
situated in the town of Coed-duon (Blackwood) and its height has been estimated
as c 241m from an uppermost contour of c 240m.
The area of its bwlch has a 216m spot height on it that appears on the
Ordnance Survey enlarged Geograph map, these values give this hill c 25m of
drop.
Craig
y Merchant 213m ST 252 910
With a summit spot height of
213m and a bwlch spot height of 191m, this hill enters the Sub-List with a drop
of 22m. The bwlch spot height comes from
the Ordnance Survey 1:50,000 map, although the actual spot is hard to
distinguish where it is placed.
Coedyprior
Common 297m SO 293 103
The name of Coedyprior Common
appears on the Ordnance Survey enlarged Geograph map and has been chosen as
this hill’s designated name, whilst the Ordnance Survey 1:25,000 and 1:50,000
scale maps have the name of the hill as Coed-y-Prior Field. The hill enters the Sub-List as it has 21m of
drop based on a summit spot height of 297m and a bwlch spot height of 276m.
Parc
Penallta 235m ST 136 953
Parc Penallta has a large
landscaped figure of a pit pony at its summit, a must visit Sub-Hill! The summit has a 235m spot height that
appears on the Ordnance Survey enlarged Geograph map, and the bwlch height has
been estimated as c 214m high based on bwlch contouring between c 210m – c
220m, these values give this hill c 21m of drop.
Pt.
223m 223m SN 800 079
This hill’s name is listed
under the Pt notation as the blog author does not know an appropriate name for
it. The area of the bwlch has three
different spot heights on it; 208m at SN 803 084, 203m at SN 802 082 and 202m
at SN 803 086, the latter two appearing on the Ordnance Survey enlarged
Geograph map. The 202m spot height has
been taken as the height of the bwlch, which gives this hill 21m of drop.
Twynau
Gwynion 229m ST 152 834
The Ordnance Survey enlarged
Geograph map gives a 208m spot height on the area of this hill’s bwlch at ST
15422 84045, whilst the 1:25,000 map has a 209m spot height placed at ST 15445
84070, as the latter is more centralised on the valley to valley traverse this
hill is included in the Sub-List with 20m of drop.
Coed
Mawr 214m ST 246 887
With a summit spot height of
214m and a bwlch spot height placed at ST 237 891 of 194m, this hill enters the
Sub-List with 20m of drop.
Pt.
275m 275m ST 192 978
Another hill that follows the
Pt notation as the blog author does not know a suitable name for it. The summit area has a 274m trig pillar on it
with Ordnance Survey 1:25,000 and 1:50,000 scale maps giving a separate spot
height of 275m near to the trig, the bwlch contouring is between c 250m – c
260m and the height of the bwlch has been estimated as c 255m, giving this hill
c 20m of drop.
This now completes the updates to the 200m Twmpau List
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