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 Twenty
First Group is the Elenydd.
Elenydd
North and then east of
the Afon Wyre at SN 527 699 to bwlch at SN 645 687, continuing east of the
Camddwr to the Afon Teifi and Cors Caron at SN 677 622, continuing east and
then south of the Afon Teifi to SN 411 401, and east of the Afon Tyweli to SN
445 363 and the Nant Grân to bwlch at SN 419 337 and the Nant Aeron to SN 418 292,
continuing south and then east and then north of the Afon Gwili to SN 431 205,
continuing north of the Afon Tywi (River Towy) to SN 753 327, continuing north and
west of the Afon Brân to SN 811 403, continuing north and west of the Afon
Gwyddon to bwlch at SN 840 432, continuing north of the Cledan to SN 893 459
and the Afon Irfon to SO 034 515, continuing west and then south of the Afon
Gwy (River Wye) to SN 841 826, continuing south of the Afon Tarrenig to
Eisteddfa Gurig at SN 797 841, the Afon Castell to SN 749 807 and the Afon
Rheidol to Aberystwyth and the sea at SN 579 808. Bordering with Pumlumon to the north, Garreg
Lwyd, Pegwn Mawr, Gwastedyn Hill and Fforest Glud to the east, Mynydd Epynt, Y
Mynydd Du and Mynydd Sylen to the south, Moelfre, Mynydd Bach and the sea to
the west.
Twmpau - 200m updates
Comins
Pen-y-banc 299m SN 675 691
This hill has been promoted
from the Sub-List and has had its previously listed name of Allt y Pantyddafad
dropped in favour of Comins Pen-y-banc, as the former name was invented by the
list author. Its promotion is based on a
summit spot height of 299m appearing on the Ordnance Survey enlarged Geograph
map, as this is two metres higher when compared to the hill at SN 656 694 the
critical bwlch is now swapped, giving this hill a dramatic increase in its drop
value from c 28m to c 92m. The hill at
SN 656 694 is now reclassified from a P30 to a Sub (see below).
Pen
Llys 292m SN 998 584
Another promotion from the
Sub-List as with a summit spot height of 292m and a spot height at the bwlch of
262m, this hill has a listed drop of 30m.
The bwlch spot height appears on the Ordnance Survey enlarged Geograph
map as SN 995 586.
Pt.
c 285m c 285m SN 972 529
This hill has been promoted
from the Sub-List and has reverted to the Pt. notation for its name as it was
previously listed as Llethr-budr, and it is inconclusive if this is the name of
the hill as mapping suggests that this name is applicable to a farm to the
south of the hill’s summit. The summit
height has been estimated as c 285m and the area of the bwlch has a 252m spot
height on the Ordnance Survey enlarged Geograph map. These values give the hill c 33m of drop.
Pt.
282m 282m SN 802 424
This hill used to be listed by
an invented name of Bryn y Bwlch-Cynnant, this has been dispensed with and it
now follows the Pt. notation until a suitable locally known name can be found
for it. This hill is another example
where the Ordnance Survey enlarged Geograph map is proving a useful addition to
those interested in hill data, as both summit and bwlch have a spot height on
this map, where it seems no other map does.
The 251m bwlch spot height appears at SN 803 426, giving this hill 31m
of drop.
Comin
y Garth 248m SN 982 548
With a summit spot height of
248m and a bwlch spot height of 218m, this hill is promoted from the Sub-List
as it has 30m of drop. The bwlch spot
height appears on the Ordnance Survey enlarged Geograph map at SN 985 554.
Pt.
245m 245m SN 917 502
This hill was always a prime
candidate for promotion from the Sub-List and with an estimated drop of c 33m
it has proved so. The drop value is
based on the 245m summit spot height and bwlch contouring between c 210m – c
220m, with the height of the bwlch estimated as c 212m. The name is another example where the Pt.
notation is preferred to its past listed name of Bryn Llwyngwilym, which was
partly invented by the list author.
Allt
Mes 217m SN 795 397
Originally listed in the
Sub-List this hill is another that was always a prime candidate for promotion
to the P30 list. With bwlch contouring
between c 180m – c 190m with an estimated bwlch height of c 184m, this hill has
c 33m of drop.
Pt.
208m 208m SN 735 366
The name of this hill reverts
to the Pt. notation as its previously listed name of Banc Llwyn-celyn was
partly invented by the list author based on the name of a farm situated just to
the south of the hill’s summit. The
bwlch contouring is between c 170m – c 180m and the height of the bwlch has
been estimated as c 175m, giving this hill a drop of c 33m, which is sufficient
for its promotion from the Sub-List.
Sub-Twmpau - 200m updates
Pt.
297m, Comins Pen-y-banc 297m SN 656 694
This hill has been
re-classified as it was originally listed as a P30. Its demotion to the Sub-List is based on a
summit spot height of 299m appearing on the Ordnance Survey enlarged Geograph
map for the hill at SN 675 691, as this is two metres higher when compared to
the hill at SN 656 694 the critical bwlch is now swapped, giving this hill a
dramatic decrease in its drop value from c 90m to c 27m. The hill at SN 675 691 is now reclassified
from a Sub to a P30 (see above).
Pt. 279m 279m
SN 714 344
Another hill name that follows the Pt notation as
no appropriate name is known for it by the blog author. This hill has two options for its critical
bwlch, one north-westward from its summit, and the other south-eastward from
its summit. Thankfully both have spot
heights on the Ordnance Survey enlarged Geograph map, with the bwlch at SN 711
346 (north-westward of summit) having a 253m spot height and the bwlch at SN
716 344 (south-eastward of summit) having a 252m spot height. As each bwlch leads to higher ground the
critical bwlch for this hill is placed at the higher of the two bwlch spot
heights, giving this hill 26m of drop.
Pt. 207m 207m
SN 664 396
This hill qualifies for the Sub-List as it has a
207m summit spot height and a 181m bwlch spot height, both of which appear on
the Ordnance Survey enlarged Geograph map.
These values give this hill 26m of drop.
Pt. 266m 266m
SN 441 329
A triangulation pillar with a flush bracket height
of 265.870m is positioned westward of this hill’s 266m summit, whereas its
bwlch is positioned eastward of its summit at SN 451 330. The bwlch has a 241m spot height on the
Ordnance Survey enlarged Geograph map, giving this hill 25m of drop.
Allt Lwyd 257m
SN 691 365
This hill qualifies for the Sub-List as it has a
232m spot height that appears at the bwlch on the Ordnance Survey enlarged
Geograph map, giving this hill 25m of drop.
Allt Ddu 295m
SN 614 301
With a summit spot height of 295m and a bwlch spot
height of 271m at SN 610 304, with the latter appearing on the Ordnance Survey
enlarged Geograph map, this hill has a drop of 24m.
Fforest 289m
SN 919 520
The area of this hill’s bwlch has a 264m spot
height that appears on the Ordnance Survey enlarged Geograph map. As it is difficult to ascertain if the
position of this spot height is at the critical bwlch the drop value is based
on an estimated bwlch height of c 265m, giving this hill a drop of c 24m.
Pt. 237m 237m
SN 639 438
The name of this hill follows the Pt. notation as
the blog author does not know an appropriate name for it. As the summit spot height is 237m and the
bwlch contouring is between c 210m – c 220m, with estimation for the bwlch
height as c 213m, this hill has a drop of c 24m.
Allt Brynarth 247m
SN 672 710
Another hill whose qualification to the Sub-List is
helped because of data from the Ordnance Survey enlarged Geograph map, as a
224m spot height appears on the area of the bwlch on this map at SN 674 707,
giving this hill a drop of 23m.
Allt y Wern 229m
SN 633 407
As the bwlch contouring for this hill is between c
200m – c 210m, with an estimated height of c 206m, this hill qualifies for the
Sub-List with c 23m of drop.
Pt. 258m 258m
SN 775 733
This hill name follows the Pt. notation as no
appropriate name is known for it by the blog author. The bwlch has a 236m spot height on it that
appears on the Ordnance Survey enlarged Geograph map, giving this hill 22m of
drop.
Pt. 225m 225m
SN 693 362
As no appropriate name is known for this hill by
the blog author it is listed under the Pt. notation. The Ordnance Survey enlarged Geograph map has
a 203m spot height on the area of the bwlch at SN 693 363, giving this hill 22m
of drop.
Comin
Cefn-poeth 224m SN 984 522
This hill qualifies for the Sub-List as the
Ordnance Survey enlarged Geograph map has a 202m spot height on the area of the
bwlch at SN 981 522, giving this hill 22m of drop.
Pt. 240m 240m
SN 432 316
As the blog author does not know an appropriate
name for this hill, it is being listed under the Pt. notation. The 240m summit height appears on the
Ordnance Survey 1:50,000 and 1:25,000 mapping, whereas their enlarged Geograph
map only has a 239m spot height at SN 433 316.
The bwlch contouring is between c 215m – c 220m and has been estimated as
c 218m, giving this hill c 22m of drop.
Pt. 208m 208m
SN 724 664
Another hill whose name is currently following the
Pt. notation as no suitable name is known for it by the blog author. The summit spot height appears on a minor
road named ‘Lisburne Road’ that heads westward out of Pontrhydfendigaid. The bwlch contouring is between c 180m – c
190m, with the bwlch height being estimated as c 186m, giving this hill c 22m
of drop.
Pt. 204m 204m
SN 683 649
The spot height at the summit of this hill is very
near to a number of buildings that are clearly marked on the Ordnance Survey
map. There is a temptation to use the
name of Pen Bryn for this hill, as this name appears close to the summit of the
hill. However, analysis of the map
indicates that this name is applicable to the buildings and not the hill,
therefore the Pt. notation has been adopted for the name of this hill. The bwlch contouring is between c 180m – c
190m with the height of the bwlch estimated as c 182m, giving this hill c 22m
of drop. There are two spot heights on
the area of the bwlch that appear on the Ordnance Survey enlarged Geograph map,
one is 185m at SN 684 654, the other is 182m at SN 683 656, analysis indicates
that neither is at the critical bwlch.
Allt
Blaen-bydernyn 283m SN 551 443
The Ordnance Survey 1:25,000 and the enlarged
Geograph maps only have an uppermost contour of c 280m, whilst the Ordnance
Survey 1:50,000 map has a 289m spot height at SN 551 443. The old Seventh Series One-Inch Ordnance
Survey map has a 947ft (288.6m) spot height at the summit for this hill, this
matches the rounded up metric figure on the 1:50,000 map. However, the Ordnance Survey 1:10,560, New
Popular One-Inch and the Historical 1:25,000 maps have a summit spot height of
927ft (282.6m). It is this figure that
is being used for this hill’s height.
The bwlch has a 261m spot height on it that appears at SN 555 439 on the
Ordnance Survey enlarged Geograph map, with a 262m spot height appearing on the
Ordnance Survey 1:50,000 map at SN 554 439 being considered as positioned too
high for the critical bwlch. The values
of 282.6m and 261m give this hill 21.6m of drop.
Cefn Creigiau c 275m
SN 766 735
A contentious entry in to the Sub-List as this
hill’s qualification is dependent upon an estimated summit height. The uppermost contour is c 270m and its
height has been estimated as c 275m based on the positioning of its descending
contours. The area of the bwlch has a
255m spot height at SN 768 736 on the Ordnance Survey enlarged Geograph map,
this spot height is not centred but has been accepted, giving this hill c 20m
of drop.
Pt. 272m 272m
SN 517 334
This hill’s name follows the Pt. notation as the
blog author does not know an appropriate name for it. Although it is tempting to use the name of
Cae’r Blaidd which appears near to this hill’s summit. However, this is probably the name given to
the buildings just to the south-east of the summit and not to the hill itself. The Ordnance Survey enlarged Geograph map has
a summit spot height of 272m, and bwlch contouring is between c 250c – c 255m,
with the bwlch height estimated as c 252m.
The area of the bwlch has a 251m spot height appearing at SN 516 338 on
the Ordnance Survey 1:50,000 and enlarged Geograph map, this is considered not
to be positioned at the critical bwlch.
The values of 272m and c 252m give this hill a drop of c 20m.
Pt. 254m 254m
SN 541 337
Another hill name that follows the Pt. notation as
no appropriate name is known for it by the blog author. The bwlch contouring is between c 230m – c
235m, with the height of the bwlch estimated as c 234m, giving this hill c 20m
of drop.
Pt. 246m 246m
SN 949 529
According to current maps the area of this hill’s
bwlch is now a quarry, or the remains of one.
The bwlch contouring is between c 220m – c 230m and the height of the
bwlch has been estimated as c 226m.
However, quarried land is notorious for giving accurate estimation of
height, but c 226m is the best I can do.
The given name follows the Pt. notation as the blog author does not know
an appropriate name for the hill. The
summit value of 246m and bwlch value of c 226m give this hill a drop of c 20m.
Next update due on the 8th September 2014
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