Change
Register
Y
Pedwarau – The 400m Hills of Wales
400m
Sub-Pedwarau
Y
Pedwarau are the Welsh hills at or above 400m and below 500m in
height that have a minimum drop of 30m.
The list’s initial compilation was completed in November 2002 and
entitled The 400m Peaks of Wales and
was first published on 19th December 2002 on the RHB Yahoo Group
file database along with the equivalent English and Manx hills, with the file
entitled the 400m hills of England, Isle
of Man and Wales, this file was uploaded by Rob Woodall who later augmented
data from Clem Clements into the database.
Over subsequent years the listing now known as Y Pedwarau has been published on the
v-g.me website and the 5everdene website in list format (22nd
October 2004), available as a downloadable e-booklet and print-booklet version on
the Europeaklist website (23rd May 2013), available as GPS
Waypoints, Google mapping and online hill bagging tick lists on the
Haroldstreet website (6th January 2014) and as of 30th January
2017 publication of Y Pedwarau
commenced on the Mapping Mountains site.
The original compilation included a sub-list of hills which was refined and included in the publication on the v-g.me and the 5everdene websites, with the sub-list on the former named ‘Hills to be surveyed’. This sub list comprised all hills identified from map study that were at or above 400m and below 500m in height and if surveyed for drop stood a chance of qualifying for the main P30 list. At the time of compilation the spot heights on Ordnance Survey maps were taken at face value as the margin of uncertainty applicable to the surveying method that ascertained them was unknown at the time. Therefore if a hill was given a drop value of 29m from its summit and bwlch spot heights it was not included in this ‘Hills to be surveyed’ sub list as it was deemed not to warrant a survey for inclusion into the main P30 list as the map had given it 29m of drop. This sub list has now been standardised and comprises all Welsh hills that are at or above 400m and below 500m in height and have 20m or more and below 30m of drop, the name of this sub list is the 400m Sub-Pedwarau.
The original compilation included a sub-list of hills which was refined and included in the publication on the v-g.me and the 5everdene websites, with the sub-list on the former named ‘Hills to be surveyed’. This sub list comprised all hills identified from map study that were at or above 400m and below 500m in height and if surveyed for drop stood a chance of qualifying for the main P30 list. At the time of compilation the spot heights on Ordnance Survey maps were taken at face value as the margin of uncertainty applicable to the surveying method that ascertained them was unknown at the time. Therefore if a hill was given a drop value of 29m from its summit and bwlch spot heights it was not included in this ‘Hills to be surveyed’ sub list as it was deemed not to warrant a survey for inclusion into the main P30 list as the map had given it 29m of drop. This sub list has now been standardised and comprises all Welsh hills that are at or above 400m and below 500m in height and have 20m or more and below 30m of drop, the name of this sub list is the 400m Sub-Pedwarau.
It wasn’t until the interest shown by Mark Trengove for this
list to be published by Europeaklist that the 400m Sub-Pedwarau were fully re-evaluated, with the subsequent
publication on 23rd May 2013 entitled Y Pedwarau and leading the way to the list becoming co-authored
with Aled Williams. After Y Pedwarau was later published on 6th
January 2014 by Phil Newby on his Haroldstreet website all future updates to
the list have been catalogued on the Mapping Mountains site.
With all updates to the list appearing on Mapping Mountains
it became evident that keeping the list up-to-date if hosted on another person’s
website was difficult to say the least, therefore on 30th January
2017 the Y Pedwarau list commenced
publication on Mapping Mountains with five sub lists accompanying the main P30 Pedwar list.
Since its original publication Y Pedwarau has changed greatly as the list is now co-authored with Aled Williams, and although the criteria has remained the same for the main P30 list, the criteria for the 400m Sub-Pedwarau has now been standardised, and the numerical data benefits from the advent of accurate surveys conducted with GPS / GNSS receiver, an expanded range of Ordnance Survey maps available online and most recently, by analysis of LIDAR data enabling greater accuracy for numerical data. However, it is not just numerical data that has seen this list develop since its first inception, it is also place-name data, and it was because of this and their mutual interest in hill lists that the authors first corresponded. The listing is also gaining in popularity as there are now four known completers of Y Pedwarau with another ten people having completed 100 or more Pedwar hills.
Since its original publication Y Pedwarau has changed greatly as the list is now co-authored with Aled Williams, and although the criteria has remained the same for the main P30 list, the criteria for the 400m Sub-Pedwarau has now been standardised, and the numerical data benefits from the advent of accurate surveys conducted with GPS / GNSS receiver, an expanded range of Ordnance Survey maps available online and most recently, by analysis of LIDAR data enabling greater accuracy for numerical data. However, it is not just numerical data that has seen this list develop since its first inception, it is also place-name data, and it was because of this and their mutual interest in hill lists that the authors first corresponded. The listing is also gaining in popularity as there are now four known completers of Y Pedwarau with another ten people having completed 100 or more Pedwar hills.
It seems fitting that the list of Y Pedwarau – The 400m Hills of Wales – 400m Sub-Pedwarau should now
benefit from a detailed Change Register, and although the great bulk of updates
to this list have been catalogued since its first inception in 2002, it is
prudent for this Change Register to initially detail the changes to this sub
list since the May 2013 publication by Europeaklist.
The Change Register to Y
Pedwarau – The 400m Hills of Wales – 400m Sub-Pedwarau appears below with
the reclassifications to the list being detailed chronologically in receding
order.
Change
Register
Y
Pedwarau – The 400m Hills of Wales
400m
Sub-Pedwarau
Esgair Saeson 498.4m at SN 79504 60391
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Esgair Saeson (SN 795 603) |
The
hill reclassifications post relating to the addition of this hill to 400m
Sub-Pedwar status was published on Mapping Mountains on the 29.11.23. As this hill has a 500m summit spot height that appears on the
contemporary Ordnance survey 1:50,000 Landranger and 1:25,000 Explorer map, its
height was above the criterion used for this list. Its inclusion as a 400m Sub-Pedwar is due to
LIDAR analysis conducted by Aled Williams, resulting in a 498.4m summit height
and a 473.8m bwlch height, with these values giving this hill 24.6m of drop. 400m Sub-Pedwar total increases by one and
confirmed as 223.
Esgair Wen 494.8m at SN 80767 66474
%20-%20LIDAR%20hill%203.jpg) |
| LIDAR image of Esgair Wen (SN 807 664) |
The
reclassification of this hill from 400m Sub-Pedwar to Pedwar status was
announced via this Change Register with a retrospective Hill Reclassifications
post published on Mapping Mountains on the 02.09.23. When
the 1st edition of the Y
Pedwarau was published by Europeaklist in May 2013 this hill was listed as
a Pedwar with 31m of drop, based on the 496m summit spot height that appears on
the contemporary Ordnance Survey 1:25,000 Explorer map and the 465m bwlch spot
height that appeared on the Ordnance Survey Vector Map Local hosted on the
Geograph website and which was entitled the Interactive Coverage Map. It was subsequently reclassified to 400m
Sub-Pedwar status due to analysis of what is now the archived Welsh LIDAR, resulting
in a 494.6m summit height and a 464.7m bwlch height, with these values giving
this hill 29.9m of drop. Its reinstatement to Pedwar
status is due to analysis of new Welsh LIDAR, resulting in a 494.8m summit height and a 464.8m bwlch
height, with these values giving this hill 30.0m of drop. 400m Sub-Pedwar total decreases by one and
confirmed as 222.
Bryn Titli 492.7m at SN 93383 75719
 |
| Bryn Titli (SN 933 757) |
The
addition of this hill to 400m Sub-Pedwar status was announced via this Change
Register with a retrospective Hill Reclassifications post published on Mapping
Mountains on the 18.08.23. Prior to its
addition as a 400m Sub-Pedwar this hill was originally listed with 19m of drop, based on the 493m summit spot height
and the 474m bwlch spot height that appeared on the Ordnance Survey Vector Map
Local hosted on Geograph website and which was entitled the Interactive
Coverage Map. Subsequently this hill was
surveyed with the Trimble GeoXH 6000 on the 12.03.16, resulting in a 492.7m
summit height positioned at SN 93383 75719 and a 472.7m bwlch height positioned
at SN 93214 76009, with these values giving this hill 19.97m of drop. However, LIDAR analysis gives a 493.0m summit
height positioned at SN 93382 75719 and a 473.0m bwlch height positioned at SN
93192 76017, with these values giving this hill 20.1m of drop. As LIDAR modelling on tussocky ground give
consistently higher absolute heights compared to the data produced by the
Trimble GeoXH 6000 for the same position, a height relative to that produced by
the Trimble is taken, resulting in a 492.7m summit height and a 472.7m bwlch
height, with these values giving this hill 20.0m of drop. 400m Sub-Pedwar total increases by one
and confirmed as 223.
Moel Wnog 471.3m at SH 73522 44084
%20-%20LIDAR%20hill%204.jpg) |
| LIDAR image of Moel Wnog (SH 735 440) |
The
reclassification of this hill from Pedwar to 400m Sub-Pedwar status was
announced via this Change Register with a retrospective Hill Reclassifications
post published on Mapping Mountains on the 11.08.23. The hill was
listed as a Pedwar with an estimated c 34m of drop, based on the 473m summit
spot height that appears on the Harvey 1:40,000 British Mountain Map and an
estimated c 439m bwlch height, based on interpolation of 10m contouring between
430m – 440m that appear on the Ordnance Survey 1:25,000 Explorer map. Its reclassification is due to detail produced by Joe
Nuttall in his surface analysis progamme, with subsequent LIDAR analysis
conducted by the DoBIH team and independently by Aled Williams and Myrddyn
Phillips, resulting in a 471.3m summit
height and a 441.5m bwlch height, with these values giving this hill 29.8m of
drop. 400m Sub-Pedwar total increases by one
and confirmed as 222.
Crin Fynydd 467.3m at SO 17846 60534 & SO 17846 60536 & SO 17853 60534
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Crin Fynydd (SO 178 605) |
The
reclassification of this hill from Pedwar to 400m Sub-Pedwar status was announced
via this Change Register with a retrospective Hill Reclassifications post
published on Mapping Mountains on the 05.08.23.
The hill was listed as a Pedwar with 30m
of drop, based on the 468m summit spot height and the 438m bwlch spot height
that appear on the Ordnance Survey 1:25,000 Explorer map. Its reclassification is due to detail produced by Joe
Nuttall in his surface analysis progamme, with subsequent LIDAR analysis
conducted by the DoBIH team and independently by Aled Williams and Myrddyn
Phillips, resulting in a 467.3m summit
height and a 438.3m bwlch height, with these values giving this hill 29.0m of
drop. 400m Sub-Pedwar total increases by one
and confirmed as 221.
Pt. 415.1m 415.1m at SO 07212 06536
%20-%20LIDAR%20hill%203.jpg) |
| LIDAR image of Pt. 415.1m (SO 072 065) |
The
addition of this hill to 400m Sub-Pedwar status was announced via this Change
Register with a retrospective Hill Reclassifications post published on Mapping
Mountains on the 24.07.23. This hill has
undergone extensive terra-forming over recent years and therefore the contemporary Ordnance Survey 1:50,000
Landranger and 1:25,000 Explorer map do not show any contours of note. Its addition to 400m Sub-Pedwar status is due
to LIDAR analysis, resulting in a 415.1m summit height and a 389.8m bwlch
height, with these values giving this hill 25.3m of drop. 400m Sub-Pedwar total increases by one and confirmed as 220.
Cefn Gwenffrwd 422.7m at SN 74078 48615
%20-%20new%20LIDAR%20hill%201.jpg) |
| LIDAR image of Cefn Gwenffrwd (SN 740 486) |
The
reclassification of this hill from 400m Sub-Pedwar to Pedwar status was
announced via this Change Register with a retrospective Hill Reclassifications
post published on Mapping Mountains on the 10.07.23. The hill was
listed as a 400m Sub-Pedwar with 29m of drop, based on the 422m summit spot
height that appears on the Ordnance Survey 1:25,000 Explorer map and the 393m bwlch
spot height that appeared on the Ordnance Survey Vector Map Local hosted on the
Geograph website and which was entitled the Interactive Coverage Map. Its reclassification is due to detail produced by Joe
Nuttall in his surface analysis progamme, with subsequent LIDAR analysis
conducted by the DoBIH team and independently by Aled Williams and Myrddyn
Phillips, resulting in a 422.7m summit
height and a 392.4m bwlch height, with these values giving this hill 30.3m of
drop. 400m Sub-Pedwar total decreases
by one and confirmed as 219.
Stonewall Hill 400.1m at SO 31823 69655
 |
| Stonewall Hill (SO 318 696) |
The addition of this hill to 400m Sub-Pedwar status is under
the classification of National Top and its Hill Reclassifications post was
published on Mapping Mountains on the 27.10.21.
The hill was analysed via LIDAR and a subsequent Trimble GeoXH 6000
summit survey conducted by Myrddyn Phillips and Aled Williams on the 17.07.21
and the 28.08.21 confirmed it as being over 400m in height, resulting in a
400.1m summit height and a 376.4m bwlch height, with these values giving this
hill 23.8m of drop. 400m Sub-Pedwar
total increases by one and confirmed as 220.
Allt y Moch 419.7m at SO 02202 84938
 |
| Allt y Moch (SO 022 849) |
The reclassification of this hill from 400m Sub-Pedwar to
Pedwar status was announced in a Hill Reclassifications post published on Mapping Mountains on the 31.10.20. The
reclassification is due to a Trimble GeoXH 6000 survey conducted by Myrddyn
Phillips and Aled Williams over two days; 11.07.20 and 18.10.20 and was
prompted by Ronnie Bowron’s evaluation of the summit analysis programme produced by Joe Nuttall. The survey resulted in a
419.7m summit height and a 389.6m bwlch height, with these values giving this
hill 30.1m of drop. 400m Sub-Pedwar
total decreases by one and confirmed as 219.
Bryn Catel 426m at SN 69703 50643
 |
| Bryn Catel (SN 697 506) |
The announcement of this hill’s addition to 400m Sub-Pedwar
status was made in a Hill Reclassification post published on Mapping Mountains
on the 29.10.20 and this is due to reassessment of detail derived from contemporary
maps produced from Ordnance Survey data, prompted by Joe Nuttall’s summit analysis programme and the examination of these data by Ronnie
Bowron. This resulted in the hill being
listed with an estimated c 24m of drop, based on the 426m summit spot height that
appears on mapping hosted on the WalkLakes website and an estimated c 402m
bwlch height based on interpolation of 5m contouring on the OS Maps
website. 400m Sub-Pedwar total increases
by one and confirmed as 220.
Pt. 464.2m 464.2m at SO 13377 48863
 |
| LIDAR image of Pt. 464.2m (SO 133 488) |
The details of the addition of this hill to 400m Sub-Pedwar
status appeared in a Hill Reclassification post published on Mapping Mountainson the 08.10.20 and this is due to LIDAR analysis conducted by Myrddyn Phillips, and was prompted
by Joe Nuttall’s summit analysis programme and the examination of these data by
Ronnie Bowron. This resulted in the
hill’s drop being amended from an estimated c 19m to 20.8m, with LIDAR giving a
464.2m summit and a 443.4m bwlch. 400m
Sub-Pedwar total increases by one and confirmed as 219.
Bryn Llwyd 474m at SN 77211 76332
The details of the addition of this hill to 400m Sub-Pedwar status appeared in a Hill Reclassification post published on Mapping Mountains on the 29.09.20 and this is due to reassessment of detail derived from contemporary maps produced from Ordnance Survey data, prompted by Joe Nuttall’s summit analysis programme and the examination of these data by Ronnie Bowron. This resulted in the hill’s drop being amended from an estimated c 19m to an estimated c 21m, based on the 474m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 453m bwlch height based on interpolation of 5m contouring on the OS Maps website. 400m Sub-Pedwar total increases by one and confirmed as 218.
Bryn Llwyd 485m at SO 10859 82548
The details of the addition of this hill to 400m Sub-Pedwar
status appeared in a Hill Reclassification post published on Mapping Mountains on the 22.09.20 and this is due to reassessment of detail on contemporary
Ordnance Survey maps, prompted by Joe Nuttall’s summit analysis programme and
the examination of these data by Ronnie Bowron.
This resulted in the hill’s drop being amended from 19m to an estimated
c 20m based on the 485m summit spot height that appears on the Ordnance Survey
1:25,000 Explorer map and an estimated c 465m bwlch height based on
interpolation of 5m contouring on the OS Maps website. 400m Sub-Pedwar total increases by one and
confirmed as 217.
Lan
Fawr 427.4m at SN 69244 50156
 |
| Lan Fawr (SN 692 501) |
The details of the reclassification of this hill back to
400m Sub-Pedwar status appeared in a Hill Reclassification post published on
Mapping Mountains on the 20.05.20 and is due to a Trimble GeoXH 6000 survey conducted
on the 05.01.20 by Myrddyn Phillips, with assistance from Rob Woodall,
resulting in a 427.4m summit height and a 398.3m bwlch height, with these
values giving this hill 29.1m of drop. 400m
Sub-Pedwar total increases by one and confirmed as 216.
29th December 2019 – Haroldstreet publishes Y Pedwarau – The 400m Hills of Wales.
400m Sub-Pedwar total confirmed as 215.
Pt.
413m 413m at SO 10581 01800
The reclassification of this hill from 400m Sub-Pedwar to
Pedwar status appeared in a Hill Reclassification post published on Mapping
Mountains on the 10.05.20 and is dependent upon re-assessment of detail on
contemporary Ordnance Survey maps, including detail on the OS Maps website,
resulting in a 413m summit height that appears as a spot height on Ordnance
Survey 1:50,000 Landranger and 1:25,000 Explorer maps and an estimated bwlch
height of c 382m based on interpolation of 5m contouring that appears on the OS
Maps website, with these values giving this hill an estimated c 31m of
drop. 400m Sub-Pedwar total decreases by
one and confirmed as 215.
Pt. 402.3m 402.3m at SN 96417 37069
 |
| LIDAR image of Pt. 402.3m (SN 964 370) |
The deletion of this hill from 400m Sub-Pedwar status
appeared in a Hill Reclassification post published on Mapping Mountains on the 25.03.20
and is dependent upon re-assessment of detail on contemporary Ordnance Survey
maps, including detail on the OS Maps website and subsequent LIDAR analysis,
resulting in a 402.3m summit height and a 385.4m bwlch height, with these
values giving this hill 16.8m of drop.
400m Sub-Pedwar total decreases by one and confirmed as 216.
Cyrnau 446m at SN 73549 53650
The deletion of this hill from 400m Sub-Pedwar status
appeared in a Hill Reclassification post published on Mapping Mountains on the
17.03.20 and is dependent upon re-assessment of detail on contemporary Ordnance
Survey maps, including detail on the OS Maps website, resulting in a 446m
summit height that appears as a spot height on the Ordnance Survey Vector Map
Local hosted on the Geograph website and which is entitled the Interactive
Coverage Map and an estimated bwlch height of c 427m based on interpolation of
5m contouring on the OS Maps website, with these values giving this hill an
estimated c 19m of drop. 400m Sub-Pedwar
total decreases by one and confirmed as 217.
Bryn Dilyw 478m at SN 83554 77970
The deletion of this hill from 400m Sub-Pedwar status
appeared in a Hill Reclassification post published on Mapping Mountains on the 13.03.20
and is dependent upon re-assessment of detail on contemporary Ordnance Survey
maps, including detail on the OS Maps website and examination of aerial maps, resulting
in a 478m summit height that appears as a spot height on Ordnance Survey 1:25,000
Explorer maps (examination of aerial maps concluded that land where the small
480m ring contour appears on the Ordnance Survey 1:25,000 Explorer map is
likely to be man-made as it resembles a deposit of earth from the construction
of a turning point near to one of the summit wind turbines) and an estimated
bwlch height of c 461m based on interpolation of 5m contouring on the OS Maps
website, with these values giving this hill an estimated c 17m of drop. 400m Sub-Pedwar total decreases by one and
confirmed as 218.
Lan Fawr 429m at SN 69253 50157
 |
| Lan Fawr (SN 692 501) |
The reclassification of this hill from 400m Sub-Pedwar to
Pedwar status appeared in a Hill Reclassification post published on Mapping Mountains on the 04.03.20 and is dependent upon re-assessment of detail on
contemporary Ordnance Survey maps, including detail on the OS Maps website,
resulting in a 429m summit height that appears as a spot height on Ordnance
Survey 1:50,000 Landranger and 1:25,000 Explorer maps and an estimated bwlch
height of c 399m based on interpolation of 5m contouring that appears on the OS
Maps website, with these values giving this hill an estimated c 30m of
drop. 400m Sub-Pedwar total decreases by
one and confirmed as 219.
Pt. 427m 427m at SN 73157 49745
This hill’s reclassification from Pedwar to 400m Sub-Pedwar status appeared in a Hill Reclassification post published on Mapping Mountains on the 10.02.20 and is dependent upon re-assessment of detail on contemporary Ordnance Survey maps, including detail on the OS Maps website and the WalkLakes website, resulting in a 427m summit height that appears as a spot height on Ordnance Survey 1:25,000 Explorer maps and an estimated bwlch height of c 398m based on interpolation of 5m contouring that appear on the OS Maps website, with these values giving this hill an estimated c 29m of drop. 400m Sub-Pedwar total increases by one and confirmed as 220.
Bryn Twyn 447.1m at SH 81545 24141
 |
| LIDAR image of Bryn Twyn (SH 815 241) |
The 400m Sub-Pedwar status of this hill was announced in a
Hill Reclassifications post that was published on Mapping Mountains on the 18.01.20,
and its addition is due to LIDAR analysis conducted by Myrddyn Phillips,
resulting in a 447.1m summit height and a 426.3m bwlch height, with these
values giving this hill 20.8m of drop. 400m
Sub-Pedwar total increases by one and confirmed as 219.
Pt. 437m 437m at SH 75146 40791
The addition of this hill to 400m Sub-Pedwar status was
announced in a Hill Reclassifications post published on Mapping Mountains on
the 12.01.20 and is based on the 437m summit spot height that appears on the
Ordnance Survey non-contour Vector Map Local hosted on the Geograph website and
the Ordnance Survey data hosted on the WalkLakes website and an estimated c
417m bwlch height based on interpolation of 5m contouring between 415m – 420m
on the OS Maps website, with these values giving this hill an estimated c 20m
of drop. 400m Sub-Pedwar total increases
by one and confirmed as 218.
Pt. 447m 447m at SH 74113 40832
This hill’s addition to 400m Sub-Pedwar status was announced
in a Hill Reclassifications post published on Mapping Mountains on the 08.01.20
and is based on the 447m summit spot height that appears on the Ordnance Survey
non-contour Vector Map Local hosted on the Geograph website and the Ordnance
Survey data hosted on the WalkLakes website and an estimated c 427m bwlch
height based on interpolation of 5m contouring between 425m – 430m on the OS
Maps website, with these values giving this hill an estimated c 20m of
drop. 400m Sub-Pedwar total increases by
one and confirmed as 217.
Bryn Crwn 488m at SH 78585 45680
The addition of this hill to 400m Sub-Pedwar status was
announced on Mapping Mountains in a Hill Reclassifications post on the 30.12.19
and is based on the 488m summit spot height that appeared on the Ordnance
Survey non-contour Vector Map Local hosted on the Geograph website and appears
as a spot height via Ordnance Survey data hosted on the WalkLakes website and an
estimated c 468m bwlch height based on interpolation of 5m contouring between
465m – 470m on the OS Maps website, with these values giving this hill an
estimated c 20m of drop. 400m Sub-Pedwar
total increases by one and confirmed as 216.
Clogau c 460m at SJ 18455 46229
 |
| Clogau (SJ 184 462) |
The addition of this hill to 400m Sub-Pedwar status was
announced on Mapping Mountains in a Hill Reclassifications post on the 01.12.19
and is dependent upon detail on the OS Maps website, resulting in a c 460m
summit height and a c 439m bwlch height, with these values giving this hill c
21m of drop. 400m Sub-Pedwar total
increases by one and confirmed as 215.
Y Foel 415m at SJ 01221 01629
The deletion of this hill from 400m Sub-Pedwar status was
announced via a Hill Reclassifications post on Mapping Mountains published on
the 21.11.19. The hill was previously
listed with an estimated c 20m of drop based on the 414m summit spot height that
appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch
height of c 394m. The deletion of this
hill is based on a variety of Ordnance Survey maps, including detail on the
non-contour Vector Map Local hosted on the Geograph website, the OS Maps
website and the WalkLakes website, resulting in this hill now being listed with
a 415m summit height and an estimated bwlch height of c 397m, with these values
giving this hill an estimated c 18m of drop.
400m Sub-Pedwar total decreases by one and confirmed as 214.
Y Gribin 485m at SH 90626 17580
The reclassification of this hill from 400m Sub-Pedwar to Pedwar
status was announced on Mapping Mountains on the 28.10.19 and is dependent upon
LIDAR analysis for its adjacent southerly hill, and examination of detail on
the OS Maps website, the WalkLakes website and online logs on the Hill Bagging
website. Resulting in a 485m summit
height that appears as a spot height on Ordnance Survey 1:50,000 Landranger and
1:25,000 Explorer maps and a 427m bwlch height that appears as a spot height on
the Ordnance Survey 1:25,000 Explorer map, with these values giving this hill
58m of drop. 400m Sub-Pedwar total decreases
by one and confirmed as 215.
Y Gribin 484.8m at SH 90233 17288
 |
| LIDAR image of Y Gribin (SH 902 172) |
The reclassification of this hill from Pedwar to 400m Sub-Pedwar status was announced on Mapping Mountains on the 24.10.19 and is
dependent upon LIDAR analysis and examination of detail on the OS Maps website,
the WalkLakes website and online logs on the Hill Bagging website. Resulting in a 484.8m summit height from LIDAR
analysis initially conducted by Aled Williams and subsequently by Myrddyn
Phillips and an estimated bwlch height of c 462m from interpolation of 5m
contouring on the OS Maps website, with these values giving this hill c 23m of
drop. 400m Sub-Pedwar total increases by
one and confirmed as 216.
Moel yr Acre 411.3m at SJ 16955 52668
 |
| Moel yr Acre (SJ 169 526) |
The Hill Reclassifications post giving details of this hill’s deletion from 400m Sub-Pedwar status was published on Mapping Mountainson the 13.10.19. The hill was previously
listed with an estimated c 20m of drop based on the 411.3m summit height
ascertained from a Leica GS15 survey conducted by John Barnard and Myrddyn
Phillips and an estimated bwlch height of c 391m. The deletion of this hill is based on
interpolation of the 5m contours on the OS Maps website and a re-assessment of
the bwlch contouring on the Ordnance Survey 1:25,000 Explorer map, resulting in
this hill now being listed with an estimated c 19m of drop. 400m Sub-Pedwar total decreases by one and
confirmed as 215.
Fynach Fawr 462.5m at SN 72685 89095
 |
| Fynach Fawr (SN 726 890) now reinstated as a Pedwar |
This hill’s reinstatement as a Pedwar was confirmed by a Trimble GeoXH 6000 survey which took
place on the 03.06.18 with the Survey Post appearing on Mapping Mountains on
the 21.08.18 and the Hill Reclassifications post appearing on the 20.09.18, the
hill was previously listed as a 400m
Sub-Pedwar due to LIDAR analysis which had resulted in its reclassification
from Pedwar status (see below). This hill was subsequently surveyed by
Myrddyn Phillips using a Trimble GeoXH 6000 resulting in a 30.3m drop
value. 400m Sub-Pedwar total decreases by one and confirmed as 216.
Fuches 449.3m at SN 86623 83656
 |
| Fuches (SN 866 836) now reinstated as a Pedwar |
The survey confirming this hill’s reinstatement as a Pedwar took place on the 03.06.18 with
the Survey Post appearing on Mapping Mountains on the 16.08.18 and the Hill Reclassifications
post appearing on the 12.09.18, the hill was previously listed as a 400m Sub-Pedwar due to LIDAR analysis
which had resulted in its reclassification from Pedwar status (see below).
This hill was subsequently surveyed by Myrddyn Phillips using a Trimble
GeoXH 6000 resulting in a 30.2m drop value.
400m Sub-Pedwar total
decreases by one and confirmed as 217.
Pt. 486m 486m at SH 774 462
 |
| Llyn Conwy from Pt. 486m (SH 774 462) |
The announcement of this hill’s addition to 400m Sub-Pedwar status appeared on
Mapping Mountains on the 27.07.18, the hill was previously listed with c 19m of
drop based on the 486m summit spot height that appears on the Ordnance Survey
1:25,000 Explorer map and an estimated bwlch height of c 467m based on
interpolation of bwlch contours between 460m – 470m. This hill’s addition is due to analysis of
data on the OS Maps website, which is the recent replacement for OS
Get-a-map. This mapping has 5m contour
intervals enabling the estimated height of the bwlch to be narrowed down when
compared to the 10m contour intervals on other Ordnance Survey maps, and with
an estimated bwlch height of c 464m, based on interpolation of contours between
460m – 465m, these values give this hill c 22m of drop, which is sufficient for
its inclusion as a 400m Sub-Pedwar. 400m Sub-Pedwar total increases by one
and confirmed as 218.
Mynydd yr Ychen 459.9m at SN 76846 79456
 |
| LIDAR image of Mynydd yr Ychen (SN 768 794) |
The reinstatement of this hill to 400m Sub-Pedwar status was announced on Mapping Mountains on the 15.07.18; the hill had been listed in this sub category with c 20m of drop and then deleted due to DTM LIDAR analysis resulting in 19.98m of drop (see below), the hill was subsequently re-analysed using the 1m DSM LIDAR model resulting in a 459.92m summit height and a 439.92m bwlch height, giving the hill 20.00m of drop, which is sufficient for it to be reinstated as a 400m Sub-Pedwar. 400m Sub-Pedwar total increases by one and confirmed as 217.
Mynydd Ty’n y Fach 408.0m at SH 68788 09702
 |
| Mynydd Ty'n y Fach (SH 687 097) is now deleted from the ranks of 400m Sub-Pedwarau |
This hill’s deletion from 400m Sub-Pedwar status was announced on Mapping Mountains on the 12.05.18,
the hill was previously listed with c 20m of drop based on the 409m summit spot
height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000
Explorer map and an estimated bwlch height of c 389m based on interpolation of
bwlch contouring between 380m – 390m. This
hill’s deletion is due to LIDAR analysis conducted by Myrddyn Phillips resulting
in a 408.0m summit height and a 389.45m bwlch height, with these values giving
this hill 18.5m of drop which is insufficient for its retention as a 400m Sub-Pedwar. 400m
Sub-Pedwar total decreases by one and confirmed as 216.
Craig y Garreg Lwyd 473.8m at SH 73047 42746
 |
| Craig y Garreg Lwyd (SH 730 427) now re-instated as a Pedwar |
The Hill Reclassification post confirming this hill’s
re-instatement to Pedwar status was
published on Mapping Mountains on the 04.10.17, the hill was previously listed
as a 400m Sub-Pedwar due to a survey
with the Trimble GeoXH 6000 which had resulted in its reclassification from Pedwar status (see below). This hill was subsequently surveyed by John
Barnard and Graham Jacking on the 24.06.17 with a Leica GS15 resulting in a
30.2m drop value. 400m Sub-Pedwar total decreases by one and confirmed as 217.
Waun Sidan 407.7m at SO 25021 72649
 |
| Waun Sidan (SO 250 726) is now reclassified to Pedwar status |
The reclassification of this hill from 400m Sub-Pedwar to Pedwar status was announced on the Mapping Mountains site on the 19.09.17, the hill was previously listed with 29m of drop based on a basic levelling survey conducted by Myrddyn Phillips on the 05.10.03. This hill’s reclassification is due to LIDAR data analysed by Aled Williams resulting in a 407.7m summit height and a 376.3m bwlch height, with these values giving this hill 31.4m of drop which is sufficient for this hill to be listed as a Pedwar. 400m Sub-Pedwar total decreases by one and confirmed as 218.
Yr Allt 437.6m at SO 07419 75572
The deletion of this hill from 400m Sub-Pedwar status was announced on Mapping Mountains on
12.09.17, the hill was previously listed with 25m of drop based on the 436m
summit spot height on the Ordnance Survey 1:25,000 Explorer map and the 411m
bwlch spot height on the Ordnance Survey enlarged mapping hosted on the
Geograph website. This hill’s deletion
is due to LIDAR data analysed by Aled Williams resulting in a 437.6m summit
height and a 418.5m bwlch height, with these values giving this hill 19.1m of
drop which is insufficient for 400m
Sub-Pedwar status. 400m Sub-Pedwar total decreases by one
and confirmed as 219.
Cefn Cynllaith 405.0m at SN 89292 51575
This hill’s addition to 400m
Sub-Pedwar status was announced on the Mapping Mountains site on 29.08.17,
the hill was previously not classified but was catalogued with 16m of drop
based on the 404m summit spot height on the Ordnance Survey 1:25,000 Explorer
map and the 388m bwlch spot height on the Ordnance Survey enlarged mapping
hosted on the Geograph website. This
hill’s addition is due to LIDAR data analysed by Aled Williams resulting in a
405.0m summit height and a 383.9m bwlch height, with these values giving this
hill 21.1m of drop which is sufficient for its inclusion as a 400m Sub-Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 220.
Pt. 442.9m 442.9m at SN 94528 64354
The addition of this hill to 400m Sub-Pedwar status was announced on Mapping Mountains on the
07.08.17, the hill was previously not classified as its uppermost 430m ring
contour that appears on Ordnance Survey 1:50,000 Landranger and 1:25,000
Explorer maps and bwlch contouring between 420m – 430m did not warrant even
P14m status. This hill’s addition is due
to LIDAR data analysed by Aled Williams resulting in a 442.9m summit height and
a 422.3m bwlch height, with these values giving this hill 20.6m of drop which
is sufficient for its inclusion as a 400m
Sub-Pedwar. 400m Sub-Pedwar total increases by one and confirmed as 219.
Disgwylfa 475.5m at SN 98210 66310
 |
| Disgwylfa (SN 982 663) |
This hill’s deletion from the 400m Sub-Pedwar category was announced on Mapping Mountains on 21.07.17, the hill was previously listed with 20m of drop based on the 477m summit and 457m bwlch spot heights that appear on the Ordnance Survey enlarged mapping hosted on the Geograph website. This hill’s deletion is due to LIDAR data analysed by Aled Williams resulting in a 475.6m summit height and a 456.1m bwlch height, with these values giving this hill 19.5m of drop, which is insufficient for 400m Sub-Pedwar inclusion. 400m Sub-Pedwar total decreases by one and confirmed as 218.
Mynydd yr Ychen 459.9m at SN 76846 79457
The deletion of this hill from 400m Sub-Pedwar status was announced on the Mapping Mountains site
on the 19.06.17, the hill was previously listed with c 20m of drop based on the
459m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer
map and an estimated bwlch height of c 439m based on interpolation of bwlch
contouring between 430m – 440m. This
hill’s deletion is due to LIDAR data analysed by Aled Williams resulting in
19.98m of drop with a 459.9m (converted to OSGM15) summit height and a 439.9m
(converted to OSGM15) bwlch height, with the drop value just below the minimum
required for inclusion to this sub category. This hill has subsequently been re-evaluated using the 1m DSM LIDAR model which gives the hill 20.00m of drop and therefore it has been reinstated to 400m Sub-Pedwar status (see above). 400m Sub-Pedwar total
decreases by one and confirmed as 219.
Coed yr Artsh 443.5m at SN 76472 76079
This hill’s addition to the status of 400m Sub-Pedwar was announced on Mapping Mountains on 13.06.17, the
hill was previously not classified, although it was catalogued with c 18m of
drop based on the 444m summit spot height that appears on the Ordnance Survey
enlarged mapping hosted on the Geograph website and an estimated bwlch height
of c 426m based on interpolation of bwlch contouring between 420m – 430m. This hill’s addition is due to LIDAR data
analysed by Aled Williams resulting in 443.5m summit height and 422.0m bwlch
height, with these values giving this hill 21.5m of drop which is sufficient
for its inclusion as a 400m Sub-Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 220.
Bryn yr Ysbyty 435.2m at SN 98523 99527
The addition of this hill to the ranks of 400m Sub-Pedwar was announced on Mapping Mountains on the 12.06.17, the hill was originally catalogued with c 20m of
drop which is sufficient for its inclusion in this sub category, however its
details were re-evaluated resulting in misinterpolation of bwlch contours and
it being catalogued with c 14m of drop.
This hill’s addition is due to LIDAR data analysed by Aled Williams
resulting in 435.2m and 413.3m summit and bwlch height respectively, with these
values giving this hill 21.9m of drop. 400m Sub-Pedwar total increases by one
and confirmed as 219.
Fuches 446.7m at SN 86610 83643
 |
| Fuches (SN 866 836) |
This hill’s reclassification from Pedwar to 400m Sub-Pedwar was announced on the Mapping Mountains site on the 11.06.17, the hill was previously listed with c 76m of drop based on an estimated summit height of c 453m and an estimated bwlch height of c 377m, with the latter based on interpolation of bwlch contouring between 370m – 380m. This hill’s reclassification is due to LIDAR data analysed by Aled Williams and is also dependent upon the details for its adjacent hill of Allt y Derw (SN 873 834), with the height of the highest hill swapping, with this affecting the position of the critical bwlch of both hills and the status of Fuches, resulting in a 446.7m summit height and a 419.2m bwlch height, with these values giving this hill 27.5m of drop which is insufficient for its retention as a Pedwar. This hill has subsequently been reinstated to Pedwar status. 400m Sub-Pedwar total increases by one and confirmed as 218.
Bryn Crugog 446.7m at SN 94130 92357
The reclassification of this hill to Pedwar status was announced on Mapping Mountains on 06.06.17, the
hill was previously listed as a 400m Sub-Pedwar
with c 20m of drop based on the 447m summit spot height that appears on the
Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated
c 427m bwlch height based on interpolation of bwlch contouring between 420m –
430m. This hill’s reclassification is
due to LIDAR data analysed by Aled Williams (and is also dependent upon the
details for its adjacent hill of Esgair Hir [SN 937 925], see below) resulting
in a 446.7m summit height and a 394.7m bwlch height, with these values giving this
hill 52.0m of drop. 400m Sub-Pedwar total decreases by one and confirmed as 217.
Esgair Hir 446.5m at SN 93723 92558
This hill’s reclassification to 400m Sub-Pedwar status was announced on Mapping Mountains on the
05.06.17, the hill was previously listed as a Pedwar with c 51m of drop based on the 448m summit spot height that
appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 397m
bwlch height based on interpolation of bwlch contouring between 390m –
400m. This hill’s reclassification is
due to LIDAR data analysed by Aled Williams (and is also dependent upon the
details for its adjacent hill of Bryn Crugog [SN 941 923], see above) resulting
in a 446.5m summit height and a 423.7m bwlch height, with these values giving
this hill 22.8m of drop which is insufficient for its continued Pedwar status. 400m
Sub-Pedwar total increases by one and confirmed as 218.
Pen y Crocbren 467.7m at SN 85485 93464
 |
| Pen y Crocbren (SN 854 934) |
The announcement of this hill’s deletion from 400m Sub-Pedwar status was made on the Mapping Mountains site on the 22.05.17, the hill was previously listed with c 21m of drop based on the 469m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps and an estimated bwlch height of c 448m based on interpolation of contours between 440m – 450m. This hill’s deletion from 400m Sub-Pedwar status is due to LIDAR data analysed by Aled Williams resulting in a 467.7m summit height and a 448.7m bwlch height, with these values giving this hill 19.0m of drop which is insufficient for it to retain its 400m Sub-Pedwar status. 400m Sub-Pedwar total decreases by one and confirmed as 217.
Moel Cyneiniog 408.4m at SN 72547 88342
This hill’s deletion from 400m Sub-Pedwar status was announced on Mapping Mountains on 18.05.17,
the hill was previously listed with c 20m of drop based on the 414m summit spot
height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch
height of c 394m based on interpolation of contours between 390m – 400m. This hill’s deletion from 400m Sub-Pedwar status is due to LIDAR data analysed by Aled Williams resulting in a 408.4m summit height and a 391.9m
bwlch height, with these values giving this hill 16.5m of drop which is
insufficient for it to retain its 400m
Sub-Pedwar status. 400m Sub-Pedwar total decreases by one
and confirmed as 218.
Fainc Fawr 466.2m at SN 74150 89367
The reclassification of this hill was announced on the
Mapping Mountains site on 14.05.17, the hill was previously listed as a Pedwar with 32m of drop based on a basic
levelling survey conducted by Myrddyn Phillips on 17.04.03 which resulted in
104ft (31.7m) of drop. This hill’s
reclassification to 400m Sub-Pedwar
status is due to LIDAR data analysed by Aled Williams resulting in a 466.2m
summit height and a 437.9m bwlch height, with these values giving this hill
28.3m of drop which is insufficient for its continued Pedwar inclusion. 400m Sub-Pedwar total increases by one
and confirmed as 219.
Fynach
Fawr 461.4m at SN 72715 89052
 |
| Fynach Fawr (SN 727 890) |
This hill’s reclassification to 400m Sub-Pedwar status was announced on the Mapping Mountains site on the 12.05.17, the hill was previously listed as a Pedwar with c 32m of drop based on the 464m summit spot height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 432m. This hill’s reclassification to 400m Sub-Pedwar status is due to LIDAR data analysed by Aled Williams resulting in a 461.4m summit height and a 432.5m bwlch height, with these values giving this hill 28.9m of drop which is insufficient for Pedwar qualification. 400m Sub-Pedwar total increases by one and confirmed as 218.
Pt. 416.8m 416.8m at SH 83743 33235
The Mapping Mountains site announced the addition of this
hill to 400m Sub-Pedwar status on the
01.05.17, the hill was previously catalogued with 19m of drop based on the 417m
summit spot height on the Ordnance Survey 1:25,000 Explorer map and the 398m
bwlch spot height on the Ordnance Survey enlarged mapping hosted on the
Geograph website. This hill’s addition is
due to LIDAR data analysed by Aled Williams resulting in a 416.8m summit and 396.7m
bwlch height giving this hill 20.1m of drop which is sufficient for its
inclusion as a 400m Sub-Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 217.
Pen y Bryn Du 455.3m at SJ 16699 34722
This hill’s deletion from 400m Sub-Pedwarau status was announced on Mapping Mountains on 23.04.17,
the hill was previously listed with 20m of drop based on the 455m summit spot
height on the Ordnance Survey 1:50,000 Landranger map and the 1:25,000 Explorer
map and the 435m bwlch spot height on the Ordnance Survey 1:25,000 Explorer map. This hill’s deletion is due to LIDAR data analysed by Aled Williams resulting in a summit height of 455.3m and a bwlch
height of 435.9m, with these values giving this hill 19.4m of drop, which is below
the minimum of 20m of drop for it to retain its 400m Sub-Pedwar status. 400m Sub-Pedwar total decreases by one
and confirmed as 216.
Pt. 458.5m 458.5m at SN 98267 11645
The deletion of this hill from the ranks of 400m Sub-Pedwarau was announced on
Mapping Mountains on 18.04.17, the hill was previously listed with 20m of drop
based on the 458m summit spot height on the Ordnance Survey 1:25,000 Explorer
map and the 438m bwlch spot height on the Ordnance Survey enlarged mapping
hosted on the Geograph website. This
hill’s deletion is due to LIDAR data analysed by Aled Williams resulting in a
summit height of 458.5m and a bwlch height of 438.9m, with these values giving
this hill 19.6m of drop, which is insufficient for it to retain its
classification as a 400m Sub-Pedwar. 400m
Sub-Pedwar total decreases by one and confirmed as 217.
Cwm Cynydd Bank 451.4m at SO 05342 72437
 |
| Cwm Cynydd Bank (SO 053 724) is now reclassified to Pedwar status |
This hill’s reclassification from 400m Sub-Pedwar status was announced on the Mapping Mountains site on the 24.03.17, the hill was previously listed with c 27m of drop based on the 444m spot height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 417m. This hill’s reclassification to Pedwar status is due to LIDAR data analysed by Aled Williams resulting in a summit height of 451.4m and a bwlch height of 416.4m, with these values giving this hill 35.0m of drop. 400m Sub-Pedwar total decreases by one and confirmed as 218.
Carreg y Gwynt 426.7m at SN 95698 77665
The announcement of this hill’s reclassification to the
ranks of 400m Sub-Pedwar was
announced on the Mapping Mountains site on 17.03.17, the hill was previously
listed as a Pedwar with 32m of drop
based on a 104ft (31.7m) basic levelling survey conducted by Myrddyn Phillips
on the 23.04.04. This hill’s
reclassification is due to LIDAR data analysed by Aled Williams resulting in a
summit height of 426.7m and a bwlch height of 398.6m, with these values giving
this hill 28.1m of drop, which is insufficient for it to retain its
classification as a Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 219.
Pt. 499.1m 499.1m at SN 86343 76073
This is the first hill reclassified from the ranks of 500m Sub-Pedwarau to 400 Sub-Pedwar status since the upper
sub category was announced as a part of the Y
Pedwarau list when publication commenced of this list on Mapping Mountains
on the 30.01.17. The reclassification of
this hill was announced on Mapping Mountains on 14.03.17, and the hill was
previously listed as a 500m Sub-Pedwar
with an estimated summit height of c 500m which was based on the relatively
flat topped summit area in relation to the dimensions of the uppermost 500m
ring contour on current Ordnance Survey maps, as well as the 27.9m drop value
ascertained by line survey on the 30.06.08 and conducted by John Barnard,
Graham Jackson, Myrddyn Phillips and David Purchase. This hill’s reclassification is due to LIDAR data analysed by Aled Williams with the resulting summit height being 499.1m which
is below the 500m threshold and therefore with a drop below 30m it qualifies
for inclusion as a 400m Sub-Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 218.
Esgair Wen 494.6m at SN 80767 66481
THIS HILL HAS SUBSEQUENTLY BEEN REINSTATED TO PEDWAR STATUS
The reclassification of this hill to 400m Sub-Pedwar status was announced on the Mapping Mountains site on
the 11.03.17, the hill was previously listed as a Pedwar with 31m of drop based on the 496m summit spot that appears
on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the
465m bwlch spot height that appears on the Ordnance Survey enlarged mapping
hosted on the Geograph website. This
hill’s reclassification is due to LIDAR data analysed by Aled Williams with the
resulting height details being 494.6m summit and 464.7m bwlch, giving this hill
29.9m of drop which is insufficient for continued Pedwar status. 400m Sub-Pedwar total increases by one
and confirmed as 217.
Banc y Llyn 473.7m at SN 80496 65235
The acceptance of Banc y Llyn as a 400m Sub-Pedwar was announced on the Mapping Mountains site on the 03.02.17, the hill was previously listed in Y Pellennig – The Remotest Hills of Wales with c 19m of drop based on the 474m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 455m based on bwlch contouring between 450m – 460m. The classification of this hill as a 400m Sub-Pedwar is from LIDAR data analysed by Aled Williams with the resulting height details being 473.7m summit and 452.0m bwlch, giving this hill 21.7m of drop. 400m Sub-Pedwar total increases by one and confirmed as 216.
Lan 413.6m at SO 05243 39144
This hill’s addition as a Pedwar was announced on the Mapping Mountains site on 30.12.16, the
hill was previously listed as a 400m
Sub-Pedwar with c 29m of drop based on an estimated summit and bwlch height
of c 407m and c 378m respectively. The
reclassification to Pedwar status is
from LIDAR data analysed by Aled Williams with the resulting height details
being 413.6m summit and 377.0m bwlch, giving this hill 36.6m of drop. 400m
Sub-Pedwar total decreases by one and confirmed as 215.
Pt.
408.4m 408.4m at SO 18603 07087
This hill is a new addition to the ranks of 400m Sub-Pedwarau and was announced on
the Mapping Mountains site on the 28.12.16, and prior to this listing the hill
was not a part of any hill list known to the authors. The hill is included as a 400m Sub-Pedwar through analysis of
LIDAR data by Aled Williams which resulted in a 408.4m summit and 386.4m bwlch
height, which gives this hill 22.0m of drop.
It should be noted that this hill comprises waste spoil from mining and
as a result it is deemed as being man-made.
400m Sub-Pedwar total
increases by one and confirmed as 216.
Pt.
408.0m, Hirfynydd 408.0m at SN 82213 05117
The deletion of this hill from 400m Sub-Pedwar status was announced on Mapping Mountains on 26.12.16,
the hill was previously listed with c 20m of drop based on the 408m summit spot
height which appears on the Ordnance Survey 1:25,000 Explorer map and an
estimated bwlch height of c 388m based on bwlch contouring between 380m –
390m. This hill’s numerical detail was
analysed with LIDAR data by Aled Williams resulting in a 408.0m summit and
389.5m bwlch height, giving this hill only 18.5m of drop. 400m
Sub-Pedwar total decreases by one and confirmed as 215.
Cefn
Bach 427.2m at SO 20819 03887
This hill’s addition as a 400m Sub-Pedwar was announced on the Mapping Mountains site on
22.12.16, the hill was previously catalogued as having only 7m of drop based on
a 416m summit spot height and a 409m bwlch spot height, with the latter
appearing on the Ordnance Survey enlarged mapping hosted on the Geograph
website, however analysis of LIDAR data by Aled Williams has shown that a
427.2m summit exists and with a bwlch height of 406.2m, this hill has 21.0m of
drop which is sufficient for its inclusion in this sub list. 400m
Sub-Pedwar total increases by one and confirmed as 216.
Twyn
Disgwylfa 428.1m at SS 99572 95976
Confirmation of this hill’s reclassification via the Mapping Mountains site on 20.12.16, the hill was previously listed as a Pedwar with 30m of drop based on a 429m
summit and 399m bwlch spot height, with the latter appearing on the Ordnance
Survey enlarged mapping hosted on the Geograph website. The reclassification to 400m Sub-Pedwar is from LIDAR data analysed by Aled Williams with
the resulting details being 428.1m summit and 399.3m bwlch, giving this hill
only 28.8m of drop. 400m Sub-Pedwar total increases by one and confirmed as 215.
Pt.
415.6m 415.6m at SO 24354 01195
The first hill to change in status to a Pedwar due to analysis of LIDAR data, with confirmation of the
change in status via the Mapping Mountains site on 18.12.16, the hill was
previously listed as a 400m Sub-Pedwar
with c 28m of drop based on a 416m summit spot height and interpolation of
bwlch contours. The reclassification to Pedwar is from LIDAR data analysed by
Aled Williams with the resulting details being 415.6m summit and 384.2m bwlch,
giving this hill 31.4m of drop which is sufficient for Pedwar qualification. 400m Sub-Pedwar total decreases by one
and confirmed as 214.
Moel
Tryfan 405.4m at SH 51781 55927
 |
| Looking across at the northerly and lower bwlch of Moel Tryfan that connects this new 400m Sub-Pedwar to its similarly named and higher adjacent peak |
The
first hill to appear in the Y Pedwarau
listing to solely benefit from the analysis of LIDAR data conducted by Aled
Williams, this hill’s inclusion in this sub category was announced on the
Mapping Mountains site on 14.12.16, and to the knowledge of the authors this
hill had never appeared in any form of hill list prior to this listing. The analysis of the LIDAR data resulted in
this hill being listed with a 405.4m summit height and a 383.9m bwlch height,
with these values giving this hill 21.5m of drop which is sufficient for its
inclusion as a 400m Sub-Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 215.
Moelfre 433.0m at SH 71733 74418
 |
| The deletion of Moelfre from the ranks of 400m Sub-Pedwar hills was reliant upon a Trimble GeoXH 6000 survey and the analysis of LIDAR data |
This
hill’s deletion from this sub category was announced on the Mapping Mountains
site on 05.12.16, the hill had previously been listed in the Y Pedwarau booklet published by
Europeaklist in May 2013 with c 21m of drop based on the 435m Ordnance Survey
summit spot height on the 1:50, 000 Landranger and the 1:25,000 Explorer maps
and an estimated bwlch height of c 414m based on bwlch contouring between 410m
– 420m, with the bwlch having two possibilities for the position of its
critical point. The summit and one of
the bwlch positions was surveyed with the Trimble GeoXH 6000 by Myrddyn
Phillips and Aled Williams on the 14.07.16, resulting in a 433.0m summit height
and a 416.9m bwlch height at SH 71909 74471, with the hill retaining its 400m Sub-Pedwar status as the second
option for the bwlch position was then estimated as being c 413m high, giving
this hill an approximate drop of c 20m. The
hill was subsequently analysed with LIDAR by Aled Williams and the second
option for the bwlch position at SH 72253 74153 was found to be 414.7m high,
resulting in this hill only having 18.3m of drop. Moelfre is the first of a significant number
of hills listed in Y Pedwarau whose
numerical data is benefiting from Aled’s analysis of LIDAR data and the
resulting reclassifications appear above.
400m Sub-Pedwar total
decreases by one and confirmed as 214.
Pt.
407.7m 407.7m at SO 18077 69277
 |
| The hill currently listed as Pt. 407.7m is now classified as a 400m Sub-Pedwar |
Confirmation
of this hill’s status change via the Mapping Mountains site on 17.04.16, the
hill was previously listed as a Pedwar
with 30m of drop based on a basic levelling survey conducted by Myrddyn
Phillips on 15.12.03 which resulted in 98ft 6″ (30.0m) of drop. This hill was subsequently surveyed with the
Trimble GeoXH 6000 by Myrddyn Phillips on 08.04.16, resulting in the hill
having only 28.3m of drop. 400m Sub-Pedwar total increases by one
and confirmed as 215.
Craig y
Garreg Lwyd 473.4m at SH 73044 42742
 |
| Craig y Garreg-lwyd just misses out on Pedwar status and is now listed as a 400m Sub-Pedwar |
Confirmation of this hill’s reclassification was announced
on the Mapping Mountains site on 20.03.16, the hill was previously listed as a Pedwar with 35m of drop based on a 478m
summit and a 443m bwlch spot height appearing on the Ordnance Survey enlarged
mapping on the Geograph website, which had been favoured for this hill’s drop
value over a basic levelling survey conducted by Myrddyn Phillips on 06.01.04
which resulted in 99ft (30.2m) of drop.
This hill was subsequently surveyed with the Trimble GeoXH 6000 by
Myrddyn Phillips on 14.03.16, resulting in the hill having only 29.9m of
drop. This hill has subsequently been surveyed by John Barnard and Graham Jackson on the 24.06.17 using a Leica GS15 resulting in a 30.2m drop value and its re-instatement as a Pedwar (see above). 400m Sub-Pedwar total increases by one and confirmed as 214.
Drysgol 483.6m at SN 94630 74415
 |
| Drysgol only entered the ranks of Pedwarau through a basic levelling survey and it is now reclassified to a 400m Sub-Pedwar through a survey with the Trimble GeoXH 6000 |
This
hill’s status change was confirmed on the Mapping Mountains site on 17.03.16,
the hill was previously listed as a Pedwar
with 31m of drop based on a basic levelling survey conducted by Myrddyn
Phillips on 13.05.05 which resulted in 102ft (31.1m) of drop. This hill was subsequently surveyed with the
Trimble GeoXH 6000 by Myrddyn Phillips and Fergal Hingerty on 12.03.16,
resulting in the hill having only 29.2m of drop, which is insufficient for it
to retain its Pedwar status. 400m
Sub-Pedwar total increases by one and confirmed as 213.
Foelas
Fechan 415.8m at SH 85408 59650
 |
| Foelas Fechan is now deleted from the ranks of 400m Sub-Pedwar hills |
This
hill’s deletion from this sub category was announced on the Mapping Mountains
site on 17.02.16, the hill had previously been listed as a 400m Sub-Pedwar with c 20m of drop based on the 417m summit spot
height and an estimated bwlch height of c 397m.
The hill was surveyed using the Trimble GeoXH 6000 by Myrddyn Phillips
on 10.02.16, resulting in 18.6m drop with a summit height of 415.8m and a bwlch
height of 397.2m. 400m Sub-Pedwar total decreases by one and confirmed as 212.
Banc
Bronderwgoed 404.2m at SN 87154 98796
 |
| Banc Bronderwgoed is now re-instated into the ranks of 400m Sub-Pedwarau |
Confirmation
of this hill’s status change via the Mapping Mountains site on 06.10.15, the
hill was previously listed as a Pedwar
with 30m of drop based on a basic levelling survey conducted by Myrddyn
Phillips on 16.10.03 which resulted in a drop value of 99ft (30.2m). This hill was subsequently surveyed with the
Trimble GeoXH 6000 by Myrddyn Phillips and Aled Williams on 08.09.15, resulting
in the hill having only 27.7m of drop, which is insufficient for it to retain
its Pedwar status. 400m
Sub-Pedwar total increases by one and confirmed as 213.
Bryn
Serth 403.9m at SO 14794 10908
 |
| Bryn Serth proved an unexpected reclassification to the ranks of 400m Sub-Pedwar hills |
This
hill’s status change was confirmed via the Mapping Mountains site on 05.09.15,
with the change in classification being a surprise as the hill was previously listed
with c 34m of drop based on a c 410m summit and c 376m bwlch height, with the
summit height being an estimation based on a small 410m ring contour which is
erroneous as no such height exists on the summit of this hill. This hill was surveyed with the Trimble GeoXH
6000 by Myrddyn Phillips and Mark Trengove on 12.08.15, resulting in a 403.9m summit
and 378.6m bwlch height, giving this hill only 25.4m of drop and therefore it
is reclassified from a Pedwar to a 400m Sub-Pedwar. 400m
Sub-Pedwar total increases by one and confirmed as 212.
Wenallt 466.4m at SN 93366 57112
 |
| Wenallt is now classified as a 400m Sub-Pedwar |
Confirmation
of this hill’s status change was announced on the Mapping Mountains site on
23.05.15, the hill was previously listed as a Pedwar with 30m of drop based on the 468m summit spot height and
the 438m bwlch spot height, with the latter appearing on the Ordnance Survey
enlarged mapping on the Geograph website.
This hill was surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips
on 21.05.15, resulting in a 466.4m summit and 438.1m bwlch height, with these
values giving this hill a drop of 28.3m.
400m Sub-Pedwar total increases
by one and confirmed as 211.
Pt.
422.3m 422.3m at SO 07382 82231
 |
| Pt. 422.3m has been reclassified from a Pedwar to a 400m Sub-Pedwar |
The
first hill to be reclassified from a Pedwar
to a 400m Sub-Pedwar through
surveying with the Trimble GeoXH 6000, with the hill’s status change being
confirmed via the Mapping Mountains site on 19.05.15, the hill’s listing as a Pedwar was based on Ordnance Survey spot
heights of 424m at the summit and 393m at the bwlch, giving this hill 31m of
drop. This hill was subsequently
surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 16.05.15, resulting
in a 422.3m summit and 393.2m bwlch height, with these values giving this hill
29.0m of drop and therefore reclassifying it to 400m Sub-Pedwar status. 400m Sub-Pedwar total increases by one
and confirmed as 210.
Mynydd
Poeth 419.3m at SH 95375 51301
 |
| Gathering data with the Trimble GeoXH 6000 at the summit of Mynydd Poeth |
The
reclassification of Mynydd Poeth was announced on the Mapping Mountains site on
26.12.14, the hill was previously listed as a 400m Sub-Pedwar with c 29m of drop based on the Ordnance Survey
417m summit spot height and an estimated bwlch height of c 388m. This hill was surveyed with the Trimble GeoXH
6000 by Myrddyn Phillips and Mark Trengove on 24.12.14, resulting in a 419.3m
summit and 387.6m bwlch height, with these values giving this hill 31.7m of
drop which is sufficient for its reclassification to Pedwar status. 400m Sub-Pedwar total decreases by one
and confirmed as 209.
Pt.
499.5m 499.5m at SH 66565 31003
 |
| Pt. 499.5m has been reclassified from a 400m Sub-Pedwar to a Pedwar |
This
hill’s reclassification to Pedwar
status was announced on the Mapping Mountains site on 27.09.14, it was
previously listed as a 400m Sub-Pedwar
with c 27m of drop based on the Ordnance Survey 499m summit spot height on the
enlarged mapping on the Geograph website and an estimated bwlch height of c
472m. This hill was surveyed with the
Trimble GeoXH 6000 by Myrddyn Phillips, Mark Trengove and Dave Middleton on
21.09.14, resulting in a 499.5m summit and 469.2m bwlch height, with these
values giving this hill 30.3m of drop. 400m Sub-Pedwar total decreases by one
and confirmed as 210.
Derlwyn 416.4m at SH 58856 58610
 |
| Gathering data at the summit of Derlwyn with the Trimble GeoXH 6000 |
This
hill’s inclusion to this sub category was announced on the Mapping Mountains
site on 16.09.14, and to the knowledge of the hill list authors this hill had
not appeared in a published hill list prior to it becoming a 400m Sub-Pedwar. The hill was surveyed using the Trimble GeoXH
6000 by Myrddyn Phillips on 09.09.14, resulting in a 20.4m drop based on a
summit height of 416.4m and a bwlch height of 396.0m. 400m
Sub-Pedwar total increases by one and confirmed as 211.
Craig y
Ganllwyd 430.9m at SH 70775 25853
 |
| Craig y Ganllwyd is now classified as a Pedwar |
Confirmation
of this hill’s inclusion into the Pedwar
ranks was announced on the Mapping Mountains site on 07.05.14, it was
previously listed as a 400m Sub-Pedwar
in the Europeaklist publication with 26m of drop based on the 423m Harvey Maps
summit spot height and the 397m bwlch spot height appearing on the Ordnance
Survey enlarged mapping on the Geograph website. This hill was surveyed with the Trimble GeoXH
6000 by Myrddyn Phillips on 03.05.14, resulting in a 430.9m summit and 397.6m
bwlch height, with these values giving this hill 33.4m of drop. 400m
Sub-Pedwar total decreases by one and confirmed as 210.
Carreg
y Big 417.0m at SN 90241 90949
 |
| Gathering data at the summit of Carreg y Big with the Trimble GeoXH 6000 which resulted in this hill being deleted from the ranks of 400m Sub-Pedwarau |
The
deletion of this hill from 400m
Sub-Pedwar status was announced on the Mapping Mountains site on 19.04.14, the
hill had previously been listed as a 400m
Sub-Pedwar with 23m of drop based on its 417m summit and 394m bwlch spot
heights that appear on the Ordnance Survey enlarged mapping hosted on the
Geograph website. The hill was
subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 18.04.14,
resulting in 19.7m of drop with a 417.0m summit and 397.3m bwlch height. 400m
Sub-Pedwar total decreases by one and confirmed as 211.
Bryn
Glas 415.5m at SH 73505 42086
 |
| The survey with the Trimble GeoXH 6000 confirmed the status of Bryn Glas as a 400m Sub-Pedwar |
The
classification of this hill to 400m
Sub-Pedwar status had been missed because of a typo when assessing the
information for the Europeaklist publication, as the hill automatically
qualifies for this sub list with a 416m summit spot height on the Ordnance
Survey enlarged mapping on the Geograph website and an estimated bwlch height
of c 395m, giving this hill c 21m of drop.
The hill’s inclusion as a 400m
Sub-Pedwar was announced on the Mapping Mountains site on 06.04.14, and it
was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 14.03.16
and the result announced on Mapping Mountains on 20.03.16, resulting in a 415.5m
summit and 393.8m bwlch height, with these values giving this hill 21.7m of
drop. 400m Sub-Pedwar total increases by one and confirmed as 212.
Cefn
Perfa 411.2m at SO 1738957973
 |
| Cefn Perfa has been surveyed using a basic levelling method, a Trimble GeoXH 6000, a Leica GS15 and by line survey |
The status change of this hill was confirmed via the Mapping Mountains site on 13.03.14, having been previously listed in the Europeaklist
publication as a 400m Sub-Pedwar with
29m of drop based on a basic levelling survey conducted on the 23.09.03 by
Myrddyn Phillips resulting in 97ft (29.6m) of drop. This hill was subsequently surveyed with the
Trimble GeoXH 6000 by Myrddyn Phillips on 11.01.14, resulting in the hill
having 30.0m of drop, this was later confirmed with a survey conducted by John
Barnard and Myrddyn Phillips on the 13.03.14 with the following results; 30.06m
drop via line survey, 30.1m drop via survey with the Leica GS15 and 30.1m drop
via survey with the Trimble GeoXH 6000. 400m Sub-Pedwar total decreases by one
and confirmed as 211.
Moelfre 476.0m at SO 12125 75995
 |
| Moelfre is now deleted from the ranks of 400m Sub-Pedwar hills |
The change in status of this hill was announced on the
Mapping Mountains site on 05.03.14, the hill had been previously listed as a 400m Sub-Pedwar with the minimum
qualifying drop of 20m based on the 475m summit spot height on Ordnance Survey
1:50,000 Landranger and 1:25,000 Explorer maps and a bwlch height of 455m, with
the details for the latter appearing on the Ordnance Survey enlarged mapping hosted
on the Geograph website. This hill was
subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on
04.03.14, resulting in the hill having a 476.0m summit and 456.2m bwlch height,
giving this hill 19.8m of drop, which is insufficient for its retention as a 400m Sub-Pedwar. 400m
Sub-Pedwar total decreases by one and confirmed as 212.
Y
Garn 474.2m at SH 75874 37543
 |
| The survey with the Trimble GeoXH 6000 confirmed that Y Garn is reclassified to Pedwar status |
The reclassification of this hill was announced on Mapping Mountains on 02.03.14, the hill had been previously listed as a 400m Sub-Pedwar with 29m of drop based
on the 474m summit spot height on Ordnance Survey 1:25,000 Explorer maps and a
bwlch height of 445m, with the details for the latter deriving from a 1461ft
levelled height on the old 1:2,500 map.
This hill was subsequently surveyed with the Trimble GeoXH 6000 by
Myrddyn Phillips and Aled Williams on 01.03.14, resulting in the hill having
31.2m of drop, which is sufficient for qualification as a Pedwar. 400m Sub-Pedwar total decreases by one and confirmed as 213.
Pt.
452.4m 452.4m at SJ 22903 44310
 |
| The hill currently listed under the name of Pt. 452.4m was the first hill to be reclassified to a 400m Sub-Pedwar through surveying with the Trimble GeoXH 6000 |
The first hill now listed as a 400m Sub-Pedwar whose classification altered due to a survey with the
Trimble GeoXH 6000, with the change in status being announced on the Mapping Mountains site on 26.02.14, previous to this survey the hill had not appeared
in any published hill list known to the authors. This hill was subsequently surveyed with the
Trimble GeoXH 6000 by Myrddyn Phillips on 26.02.14, resulting in a 452.4m
summit and 429.9m bwlch height, with these values giving this hill 22.6m of
drop, which is sufficient for its inclusion as a 400m Sub-Pedwar. 400m Sub-Pedwar total increases by one
and confirmed as 214.
6th
January 2014 – Haroldstreet publishes Y
Pedwarau.
400m
Sub-Pedwar total confirmed as 213.
23rd
May 2013 – Europeaklist publishes Y
Pedwarau.
400m
Sub-Pedwar total confirmed as 213.
Myrddyn Phillips and Aled Williams (January 2017)
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