The Welsh P15s – Significant Name Changes
The Welsh P15s are all Welsh hills that have a minimum of 15m of drop, irrespective of their height. Accompanying the main P15 list is a sub list entitled; The Welsh Sub-P15s, with the qualification to this sub category being all Welsh hills with 14m or more and below 15m of drop.
The list is authored by Myrddyn Phillips and the posts that have appeared on Mapping Mountains detailing the significant name changes to the main P15 list and the sub list that are below P20 and therefore documented in other lists, appear below presented chronologically in receding order.
Mapping Mountains - Significant Name Changes - The Welsh P15s
Lan Tir Hen (SO 023 506) - 160th significant name change
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Lan Tir Hen (SO 023 506) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the A483 road to its north and a minor road to its south, and has the town of Llanfair-ym-Muallt (Builth Wells) towards the east north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was listed under the point (Pt. 163m) notation, with an estimated c 16m of drop, based on the 163m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 147m bwlch height, based on interpolation of 10m contouring between 140m – 150m.
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| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 440 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named Lan Tir Hen in the apportionments, with the details on the Tithe map appearing in the parish named as Llanynys and in the county named as Breconshire.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Lan Tir Hen, and this was derived from the Tithe map.
The full details for the hill are:
Group: Mynydd Epynt
Name: Lan Tir Hen
Previously Listed Name: Pt. 163m
OS 1:50,000 map: 147
Summit Height: 163.7m (LIDAR)
Summit Grid Reference: SO 02343 50631 (LIDAR)
Bwlch Height: 146.9m (LIDAR)
Bwlch Grid Reference: SO 02282 50522 (LIDAR)
Drop: 16.8m (LIDAR)
Myrddyn Phillips (December 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Cae Cefn Issa (SH 692 009) - 159th significant name change
Hill Reclassifications post for Cae Cefn Issa
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Cae Cefn Issa (SH 692 009) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Tarren y Gesail group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its south, and has the town of Machynlleth towards the east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, and was subsequently documented under the point (Pt. c 120m) notation with an estimated c 13m of drop, based on an estimated c 120m summit height and an estimated c 107m bwlch height, with both heights based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 179 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named Cae Cefn Issa in the apportionments, with the details on the Tithe map appearing in the parish named as Tywyn and in the county named as Merioneth.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Cae Cefn Issa, and this was derived from the Tithe map.
The full details for the hill are:
Group: Tarren y Gesail
Name: Cae Cefn Issa
Previously Listed Name: Pt. c 120m
OS 1:50,000 map: 135
Summit Height: 119.5m (LIDAR)
Summit Grid Reference: SH 69202 00955 (LIDAR)
Bwlch Height: 103.9m (LIDAR)
Bwlch Grid Reference: SH 69081 01055 (LIDAR)
Drop: 15.5m (LIDAR)
Myrddyn Phillips (December 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Coed Cefn Coch (SH 670 000) - 158th significant name change
Summit Relocations post for Coed Cefn Coch
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Coed Cefn Coch (SH 670 000) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Tarren y Gesail group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with a minor road to its south and the A493 road farther to its south-east, and has the small community of Cwrt towards the east.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed under the point (Pt. c 186m) notation with an estimated c 20m of drop, based on an estimated c 186m summit height positioned at SH 67033 00055 and an estimated c 166m bwlch height, with both heights based on interpolation of 10m contouring.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed. The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.
LIDAR analysis gives the highest ground on this hill as 185.55m positioned at SH 67096 00076. As this position is to land incorporating Coed Cefn Coch, it is this name that is being used for listing purposes.
Therefore, the name this hill is now listed by in the The Welsh P15s is Coed Cefn Coch, and this was derived from the contemporary Ordnance Survey 1:25,000 Explorer map.
The full details for the hill are:
Group: Tarren y Gesail
Name: Coed Cefn Coch
Previously Listed Name: Pt. c 186m
OS 1:50,000 map: 135
Summit Height: 185.55m (LIDAR)
Summit Grid Reference: SH 67096 00076 (LIDAR)
Bwlch Height: 166.5m (LIDAR)
Bwlch Grid Reference: SH 66830 00005 (LIDAR)
Drop: 19.0m (LIDAR)
Myrddyn Phillips (November 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Cae Grib (SN 679 992) - 157th significant name change
Hill Reclassifications post for Cae Grib
Significant Height Revisions post for Cae Grib
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20summit%201.jpg) |
| LIDAR image of Cae Grib (SN 679 992) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Tarren y Gesail group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its immediate north-west, and has the small community of Cwrt towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, and was subsequently documented under the point (Pt. c 38m) notation with an estimated c 5m of drop, based on an estimated c 38m summit height and an estimated c 33m bwlch height, with both heights based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 111 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named Cae Grib in the apportionments, with the details on the Tithe map appearing in the parish named as Tywyn and in the county named as Merioneth.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Cae Grib, and this was derived from the Tithe map.
The full details for the hill are:
Group: Tarren y Gesail
Name: Cae Grib
Previously Listed Name: Pt. c 38m
OS 1:50,000 map: 135
Summit Height: 45.4m (LIDAR)
Summit Grid Reference: SN 67980 99200 (LIDAR)
Bwlch Height: 29.95m (LIDAR)
Bwlch Grid Reference: SN 67971 99264 (LIDAR)
Drop: 15.4m (LIDAR)
Myrddyn Phillips (November 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Coed Felin Lodge (SN 663 932) - 156th significant name change
Hill Reclassifications post for Coed Felin Lodge
Significant Height Revisions post for Coed Felin Lodge
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Coed Felin Lodge (SN 663 932) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4353 road to its south-west and the A487 road to its east, and has the town of Machynlleth towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, and was subsequently documented under the name of Felin Lodge Wood, which is a prominent name that appears adjacent to the summit on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
The intricacies of language and prioritising one in favour of another for listing a hill is fraught with complication, with originating Cymraeg names being anglicised and also originating English names being cymricised, examples such as these are more common in border country and especially so for anglicised forms. There is no steadfast rule that fits all, but as a standard a name that has its origins in the Welsh language and where this is substantiated by either historic documentation and/or contemporary usage should be prioritised in favour of a contemporary anglicised or English version of the name. Likewise, if a name exists where an element of it is in English and if this name applies to a hill that is situated in a Welsh speaking part of Wales it is standard practice to use a full Welsh term for the name. It is also standard practice to use a Welsh name for a hill if another name exists that has originated in a different language.
Therefore, the name this hill is now listed by in the The Welsh P15s is Coed Felin Lodge, and this was derived from the Ordnance Survey 1:25,000 Explorer map with the language protocol also implemented.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Coed Felin Lodge
Previously Listed Name: Felin Lodge Wood
OS 1:50,000 map: 135
Summit Height: 70.9m (LIDAR)
Summit Grid Reference: SN 66384 93253 (LIDAR)
Bwlch Height: 52.1m (LIDAR)
Bwlch Grid Reference: SN 66457 93532 (LIDAR)
Drop: 18.8m (LIDAR)
Myrddyn Phillips (November 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Allt y Brain (SN 660 927) - 155th significant name change
Hill Reclassifications post for Allt y Brain
Significant Height Revisions post for Allt y Brain
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%205.jpg) |
| LIDAR image of Allt y Brain (SN 660 927) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4353 road to its south-west and the A487 road to its east, and has the town of Machynlleth towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, and was subsequently documented with an estimated c 8m of drop and listed under the point (Pt. c 27m) notation, based on an estimated c 27m summit height and an estimated c 19m bwlch height, with both heights based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
Since the original compilation of this list there have been a number of maps made available online. Some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website. Whilst others were digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites, and it is the series of Ordnance Survey Six-Inch maps that form the basis of the change in the listed name of this hill.
The Ordnance Survey series of Six-Inch maps formed the base map Ordnance Survey used for many decades leading to the production of the 1:10,000 Series of maps, both have now been superseded by the digitised Master Map. The series of Six-Inch maps are excellent for name placement and especially so compared to the contemporary Ordnance Survey 1:25,000 Explorer map, and it is the series of Six-Inch maps that position the name of Allt y Brain to land where the summit of this hill is situated.
%20-%20Six-Inch.jpg) |
| Extract from the Ordnance Survey series of Six-Inch maps |
Therefore, the name this hill is now listed by in the The Welsh P15s is Allt y Brain, and this was derived from the Ordnance Survey series of Six-Inch maps.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Allt y Brain
Previously Listed Name: Pt. c 27m
OS 1:50,000 map: 135
Summit Height: 35.4m (LIDAR)
Summit Grid Reference: SN 66012 92718 (LIDAR)
Bwlch Height: 18.5m (LIDAR)
Bwlch Grid Reference: SN 66123 92883 (LIDAR)
Drop: 16.9m (LIDAR)
Myrddyn Phillips (October 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Foel Fach (SN 688 955) - 154th significant name change
Hill Reclassifications post for Foel Fach
Significant Height Revisions post for Foel Fach
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%203.jpg) |
| LIDAR image of Foel Fach (SN 688 955) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north and south, and the A487 road to its west, and has the town of Machynlleth towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, and was subsequently documented with an estimated c 9m of drop and listed under the point (Pt. c 58m) notation, based on an estimated c 58m summit height and an estimated c 49m bwlch height, with both heights based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
Since the original compilation of this list there have been a number of maps made available online. Some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website. Whilst others were digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites, and it is the series of Ordnance Survey Six-Inch maps that form the basis of the change in the listed name of this hill.
The Ordnance Survey series of Six-Inch maps formed the base map Ordnance Survey used for many decades leading to the production of the 1:10,000 Series of maps, both have now been superseded by the digitised Master Map. The series of Six-Inch maps are excellent for name placement and especially so compared to the contemporary Ordnance Survey 1:25,000 Explorer map, and it is the series of Six-Inch maps that position the name of Foel Fach to land where the summit of this hill is situated.
%20-%20Six-Inch.jpg) |
| Extract from the Ordnance Survey series of Six-Inch maps |
Therefore, the name this hill is now listed by in the The Welsh P15s is Foel Fach, and this was derived from the Ordnance Survey series of Six-Inch maps.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Foel Fach
Previously Listed Name: Pt. c 58m
OS 1:50,000 map: 135
Summit Height: 65.4m (LIDAR)
Summit Grid Reference: SN 68831 95574 (LIDAR)
Bwlch Height: 46.1m (LIDAR)
Bwlch Grid Reference: SN 68880 95570 (LIDAR)
Drop: 19.3m (LIDAR)
Myrddyn Phillips (October 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Gamallt (SN 968 714) - 153rd significant name change
Hill Reclassifications post for Gamallt
There has been a Significant Name Change to a hill that was listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%203.jpg) |
| LIDAR image of Gamallt (SN 968 714) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Hirddywel group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B2), and it is positioned with minor roads to its north, west and east, and the A470 road farther to its west, and has the town of Rhaeadr Gwy (Rhayader) towards the south.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the main list under the point (Pt. 398m) notation with 15m of drop, based on the 398m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 383m 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.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The Tithe maps can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. However, in this instance it is the Tithe map that names the extended land where the summit of this hill is situated as a part of the land known as Gamallt.
Therefore, the name this hill is now listed by is Gamallt, and this was derived from the Tithe map.
The full details for the hill are:
Group: Hirddywel
Name: Gamallt
Previously Listed Name: Pt. 398m
OS 1:50,000 map: 136, 147
Summit Height: 397.4m (LIDAR)
Summit Grid Reference: SN 96811 71472 (LIDAR)
Bwlch Height: 383.5m (LIDAR)
Bwlch Grid Reference: SN 96756 71262 (LIDAR)
Drop: 13.9m (LIDAR)
Myrddyn Phillips (October 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Ynys Greigiog (SN 672 946) - 152nd significant name change
Hill Reclassifications post for Ynys Greigiog
Significant Height Revisions post for Ynys Greigiog
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Ynys Greigiog (SN 672 946) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its south-east, and has the town of Machynlleth towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, and was subsequently documented under the point (Pt. c 19m) notation with an estimated c 5m of drop, based on an estimated c 19m summit height and an estimated c 14m bwlch height, with both heights based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 548 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as a part of Ynys Greigiog in the apportionments, with the details on the Tithe map appearing in the parish named as Llanfihangel Genau’r Glyn and in the county named as Cardigan.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Ynys Greigiog, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Ynys Greigiog
Previously Listed Name: Pt. c 19m
OS 1:50,000 map: 135
Summit Height: 25.2m (LIDAR)
Summit Grid Reference: SN 67268 94660 (LIDAR)
Bwlch Height: 9.5m (LIDAR)
Bwlch Grid Reference: SN 67379 94463 (LIDAR)
Drop: 15.7m (LIDAR)
Myrddyn Phillips (September 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Banc Ucha (SN 663 942) - 151st significant name change
There has been a Significant Name Change to a hill that was listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Banc Ucha (SN 663 942) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4353 road to its south-west and the A487 road to its south-east, and has the small community of Borth towards the south-west.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the accompanying sub list under the point (Pt. 23m) notation with an estimated c 14m of drop, based on the 23m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 9m bwlch height, based on interpolation of 10m contouring between 0 – 10m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 54 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Banc Ucha in the apportionments, with the details on the Tithe map appearing in the parish named as Llangynfelyn and in the county named as Cardigan.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Banc Ucha, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Banc Ucha
Previously Listed Name: Pt. 23m
OS 1:50,000 map: 135
Summit Height: 24.0m (LIDAR)
Summit Grid Reference: SN 66390 94246 (LIDAR)
Bwlch Height: 9.6m (LIDAR)
Bwlch Grid Reference: SN 66330 94133 & SN 66332 94132 (LIDAR)
Drop: 14.4m (LIDAR)
Myrddyn Phillips (September 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Gwenffrwd (SN 672 936) - 150th significant name change
There has been a Significant Name Change to a hill that was listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Gwenffrwd (SN 672 936) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its north-west and a minor road to its south, and has the town of Machynlleth towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the accompanying sub list under the point (Pt. c 142m) notation with an estimated c 19m of drop, based on an estimated c 142m summit height and an estimated c 123m bwlch height, with both heights based on interpolation of 10m contouring that appear on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 650 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as a part of the farm of Gwenffrwd in the apportionments, with the details on the Tithe map appearing in the parish named as Llanfihangel Genau’r Glyn and in the county named as Cardigan.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Gwenffrwd, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Gwenffrwd
Previously Listed Name: Pt. c 142m
OS 1:50,000 map: 135
Summit Height: 141.85m (LIDAR)
Summit Grid Reference: SN 67232 93644 (LIDAR)
Bwlch Height: 122.3m (LIDAR)
Bwlch Grid Reference: SN 67357 93545 (LIDAR)
Drop: 19.5m (LIDAR)
Myrddyn Phillips (September 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Ffridd Bella (SH 757 013) - 149th significant name change
Hill Reclassifications post for Ffridd Bella
There has been a Significant Name Change to a hill that was listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%203.jpg) |
| LIDAR image of Ffridd Bella (SH 757 013) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4404 to its north, the A487 road to its west and the A489 road to its south, and has the town of Machynlleth towards the west south-west.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the accompanying sub list under the point (Pt. c 50m) notation with an estimated c 14m of drop, based on an estimated c 50m summit height and an estimated c 36m bwlch height, with both heights based on interpolation of 10m contouring that appear on the Ordnance Survey 1:25,000 Explorer map.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 640 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Ffridd Bella in the apportionments, with the details on the Tithe map appearing in the parish named as Machynlleth and in the county named as Montgomery.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Ffridd Bella, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Ffridd Bella
Previously Listed Name: Pt. c 50m
OS 1:50,000 map: 135
Summit Height: 50.8m (LIDAR)
Summit Grid Reference: SH 75754 01373 (LIDAR)
Bwlch Height: 32.0m (LIDAR)
Bwlch Grid Reference: SH 75674 01458 & SH 75676 01457 (LIDAR)
Drop: 18.8m (LIDAR)
Myrddyn Phillips (August 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Parc (SN 758 997) - 148th significant name change
Hill Reclassifications post for Parc
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Parc (SN 758 997) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north, west and east, and the A489 road farther to its north and the A487 road farther to its west, and has the town of Machynlleth towards the north-west.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the main list under the point (Pt. 182m) notation with an estimated c 15m of drop, based on the 182m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 167m bwlch height, based on interpolation of 10m contouring between 160m – 170m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website, there have been a number of maps made available online. Some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website. Whilst others were digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites, and it is the series of Ordnance Survey Six-Inch maps that form the basis of the change in the listed name of this hill.
%20-%20Six-Inch.jpg) |
| Extract from the Ordnance Survey series of Six-Inch maps |
The Ordnance Survey series of Six-Inch maps formed the base map Ordnance Survey used for many decades leading to the production of the 1:10,000 Series of maps, both have now been superseded by the digitised Master Map. The series of Six-Inch maps are excellent for name placement and especially so compared to the contemporary Ordnance Survey 1:25,000 Explorer map, and it is the series of Six-Inch maps that position the name of Parc to land where the summit of this hill is situated.
Therefore, the name this hill is now listed by in the The Welsh P15s is Parc, and this was derived from the Ordnance Survey series of Six-Inch maps for confirmation of the name placement.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Parc
Previously Listed Name: Pt. 182m
OS 1:50,000 map: 135
Summit Height: 181.6m (LIDAR)
Summit Grid Reference: SN 75832 99761 (LIDAR)
Bwlch Height: 167.4m (LIDAR)
Bwlch Grid Reference: SN 75778 99680 (LIDAR)
Drop: 14.2m (LIDAR)
Myrddyn Phillips (August 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Ffridd (SN 727 981) - 147th significant name change
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Ffridd (SN 727 981) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its west and minor roads to its south and east, and has the town of Machynlleth towards the north north-east.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 20m of drop, based on the 217m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 197m bwlch height, based on interpolation of 10m contouring between 190m – 200m, and under the name of Cefn maesmawr Bach, which is a prominent name that appears adjacent to the summit of this hill on the Ordnance Survey 1:25,000 Explorer map and which applies to a farm and not the actual hill.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 1052 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Ffridd in the apportionments, with the details on the Tithe map appearing in the parish named as Machynlleth and in the county named as Montgomery.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Ffridd, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Ffridd
Previously Listed Name: Cefn maesmawr Bach
OS 1:50,000 map: 135
Summit Height: 216.9m (LIDAR)
Summit Grid Reference: SN 72786 98132 (LIDAR)
Bwlch Height: 197.9m (LIDAR)
Bwlch Grid Reference: SN 72815 98240 (LIDAR)
Drop: 18.9m (LIDAR)
Myrddyn Phillips (August 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Ffridd (SN 731 981) - 146th significant name change
Hill Reclassifications post for Ffridd
Significant Height Revisions post for Ffridd
There has been a Significant Name Change to a hill that was listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Ffridd (SN 731 981) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its west, south and east, and the A487 road to its north-west, and has the town of Machynlleth towards the north north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the main list under the point (Pt. 216m) notation with an estimated c 18m of drop, based on the twin 216m spot heights that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 198m bwlch height, based on interpolation of 10m contouring between 190m – 200m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 1104 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Ffridd in the apportionments, with the details on the Tithe map appearing in the parish named as Machynlleth and in the county named as Montgomery.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Ffridd, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Ffridd
Previously Listed Name: Pt. 216m
OS 1:50,000 map: 135
Summit Height: 206.6m (LIDAR)
Summit Grid Reference: SN 73124 98128 (LIDAR)
Bwlch Height: 199.5m (LIDAR)
Bwlch Grid Reference: SN 73065 98032 (LIDAR)
Drop: 7.1m (LIDAR)
Myrddyn Phillips (July 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Ffridd (SN 730 979) - 145th significant name change
Significant Height Revisions post for Ffridd
Summit Relocations post for Ffridd
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%205.jpg) |
| LIDAR image of Ffridd (SH 730 979) |
The criteria for the list that this name change applies to are:
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its north-west and minor roads to its south and east, and has the town of Machynlleth towards the north north-east.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed under the point (Pt. 216m) notation with an estimated c 22m of drop, based on the twin 216m summit spot heights positioned at SN 72979 97898 and SN 73120 98126 that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 194m bwlch height, based on interpolation of 10m contouring between 190m – 200m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 1104 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Ffridd in the apportionments, with the details on the Tithe map appearing in the parish named as Machynlleth and in the county named as Montgomery.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Ffridd, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Ffridd
Previously Listed Name: Pt. 216m
OS 1:50,000 map: 135
Summit Height: 209.7m (LIDAR)
Summit Grid Reference: SN 73032 97996 (LIDAR)
Bwlch Height: 193.9m (LIDAR)
Bwlch Grid Reference: SN 72854 98987 & SN 72854 97990 (LIDAR)
Drop: 15.8m (LIDAR)
Myrddyn Phillips (July 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Y Foel (SN 730 992) - 144th significant name change
Hill Reclassifications post for Y Foel
Summit Relocations post for Y Foel
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%204.jpg) |
| LIDAR image of Y Foel (SN 730 992) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its north-west and minor roads to its south and east, and has the town of Machynlleth towards the north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the main list under the point (Pt. 143m) notation with an estimated c 15m of drop, based on the 143m summit spot height positioned at SN 72970 99159 that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 128m bwlch height, based on interpolation of 10m contouring between 120m – 130m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 831 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Y Foel in the apportionments, with the details on the Tithe map appearing in the parish named as Machynlleth and in the county named as Montgomery.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Y Foel, and this was derived from the Tithe map.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Y Foel
Previously Listed Name: Pt. 143m
OS 1:50,000 map: 135
Summit Height: 143.8m (LIDAR)
Summit Grid Reference: SN 73037 99236 (LIDAR)
Bwlch Height: 129.1m (LIDAR)
Bwlch Grid Reference: SN 73017 99102 (LIDAR)
Drop: 14.7m (LIDAR)
Myrddyn Phillips (July 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Coed Gelli Lydan (SN 741 993) - 143rd significant name change
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Coed Gelli Lydan (SN 741 993) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its west, the A487 road to its north-west, and has the town of Machynlleth towards the north north-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the main P15 list under the point (Pt. 172m) notation, with an estimated c 15m of drop, based on the 172m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 157m bwlch height, based on interpolation of 10m contouring between 150m – 160m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website, there have been a number of maps made available online. Some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website. Whilst others were digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites, and it is the series of Ordnance Survey Six-Inch maps that form the basis of the change in the listed name of this hill.
The Ordnance Survey series of Six-Inch maps formed the base map Ordnance Survey used for many decades leading to the production of the 1:10,000 Series of maps, both have now been superseded by the digitised Master Map. The series of Six-Inch maps are excellent for name placement and especially so compared to the contemporary Ordnance Survey 1:25,000 Explorer map, and it is the series of Six-Inch maps that position the name of Coed Gelli Lydan to land where the summit of this hill is situated.
%20-%20Six-Inch.jpg) |
| Extract from the Ordnance Survey series of Six-Inch maps |
Therefore, the name this hill is now listed by in the The Welsh P15s is Coed Gelli Lydan, and this was derived from the Ordnance Survey series of Six-Inch maps.
The full details for the hill are:
Group: Banc Llechwedd Mawr
Name: Coed Gelli Lydan
Previously Listed Name: Pt. 172m
OS 1:50,000 map: 135
Summit Height: 171.8m (LIDAR)
Summit Grid Reference: SN 74154 99355 (LIDAR)
Bwlch Height: 155.3m (LIDAR)
Bwlch Grid Reference: SN 74338 99421 (LIDAR)
Drop: 16.5m (LIDAR)
Myrddyn Phillips (June 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
R’allt (SH 717 028) - 142nd significant name change
Hill Reclassifications post for R'allt
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%204.jpg) |
| LIDAR image of R'allt (SH 717 028) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Tarren y Gesail group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its south and the A487 road to its east, and has the town of Machynlleth towards the south-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in the main P15 or Sub P14 list, as with an uppermost 210m ring contour and bwlch contouring between 200m – 210m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, it was deemed not to have sufficient prominence to be listed.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
With subsequent interpolation this hill was listed under the point (Pt. c 216m) notation with an estimated c 13m of drop, based on an estimated c 216m summit height and an estimated c 203m bwlch height, with both heights based on interpolation of 10m contouring.
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 855 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as R’allt in the apportionments, with the details on the Tithe map appearing in the parish named as Pennal and in the county named as Merioneth.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is R’allt, and this was derived from the Tithe map.
The full details for the hill are:
Group: Tarren y Gesail
Name: R’allt
Previously Listed Name: Pt. c 216m
OS 1:50,000 map: 135
Summit Height: 216.4m (LIDAR)
Summit Grid Reference: SH 71732 02845 & SH 71735 02846 (LIDAR)
Bwlch Height: 201.0m (LIDAR)
Bwlch Grid Reference: SH 71653 02894 (LIDAR)
Drop: 15.4m (LIDAR)
Myrddyn Phillips (June 2025)
Mapping Mountains - Significant Name Changes - The Welsh P15s
Bryn Mawr (SH 712 025) - 141st significant name change
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
%20-%20LIDAR%20hill%202.jpg) |
| LIDAR image of Bryn Mawr (SH 712 025) |
The criteria for the list that this name change applies to are:
 |
| The Welsh P15s by Myrddyn Phillips |
The hill is adjoined to the Tarren y Gesail group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its south and the A487 road to its east, and has the town of Machynlleth towards the east south-east.
When the listing that became known as The Welsh P15s was being compiled, this hill was included in the main list under the point (Pt. 175m) notation with an estimated c 18m of drop, based on the 175m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 157m bwlch height, based on interpolation of 10m contouring between 150m – 160m.
%20-%201%2025000.jpg) |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
As the summit of this hill comprises bounded land the details for it were examined on the Tithe map. The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act. This act allowed tithes to be paid in cash rather than goods. The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land. This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.
%20-%20Tithe.jpg) |
| Extract from the Tithe map |
The enclosed land where the summit of this hill is situated is given the number 865 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land. The land where the summit of this hill is situated is named as Bryn Mawr in the apportionments, with the details on the Tithe map appearing in the parish named as Pennal and in the county named as Merioneth.
%20-%20apportionments.jpg) |
| Extract from the apportionments |
Therefore, the name this hill is now listed by in the The Welsh P15s is Bryn Mawr, and this was derived from the Tithe map.
The full details for the hill are:
Group: Tarren y Gesail
Name: Bryn Mawr
Previously Listed Name: Pt. 175m
OS 1:50,000 map: 135
Summit Height: 175.4m (LIDAR)
Summit Grid Reference: SH 71220 02516 (LIDAR)
Bwlch Height: 159.1m (LIDAR)
Bwlch Grid Reference: SH 71346 02622 (LIDAR)
Drop: 16.3m (LIDAR)
Myrddyn Phillips (June 2025)
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