Mapping Mountains - Significant Name Changes - 30-99m Twmpau

 

30-99m Twmpau – Significant Name Changes

The 30-99m Twmpau (thirty welsh metre prominences and upward) are the Welsh hills at or above 30m and below 100m in height that have a minimum drop of 30m.  Accompanying the main P30 list is a sub list entitled the 30-99m Sub-Twmpau with the qualification to this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m 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 P30 list and the sub list appear below presented chronologically in receding order.

Mapping Mountains - Significant Name Changes - 30-99m Twmpau

Ffridd (SN 708 986) - 107th significant name change

Hill Reclassifications post for Ffridd

There has been a Significant Name Change to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Ffridd (SN 708 986)

The criteria for the list that this name change applies to are:

30-99m Twmpau - Welsh hills at or above 30m and below 100m in height that have 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau, with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward. 

30-99m Twmpau by Myrddyn Phillips

The hill is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its west and a minor road to its east, and has the town of Machynlleth towards the north-east.

When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.

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. 98m) notation with an estimated c 21m of drop, based on the 98m 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 77m bwlch height, based on interpolation of 10m contouring between 70m – 80m. 

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. 

Extract from the Tithe map

The enclosed land where the summit of this hill is situated is given the number 980 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 of Machynlleth and in the county named as Montgomery. 

Extract from the apportionments

Therefore, the name this hill is now listed by in the 30-99m Twmpau 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. 98m 

OS 1:50,000 map:  135

Summit Height:  97.6m (LIDAR) 

Summit Grid Reference:  SN 70875 98692 (LIDAR)               

Bwlch Height:  74.5m (LIDAR) 

Bwlch Grid Reference:  SN 71072 98917 (LIDAR) 

Drop:  23.1m (LIDAR) 

 

Myrddyn Phillips (October 2024)

 

Mapping Mountains - Significant Name Changes - 30-99m Twmpau

Box Cemetery (SN 520 009) - 106th significant name change

Hill Reclassifications post for Box Cemetery

 

There has been a Significant Name Change to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Box Cemetery (SN 520 009)

The criteria for the list that this name change applies to are:

30-99m Twmpau - Welsh hills at or above 30m and below 100m in height that have 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau, with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward. 

30-99m Twmpau by Myrddyn Phillips

The hill is adjoined to the Mynydd Sylen group of hills, which are situated in the southern part of South Wales (Region B, Sub-Region B5), and it is positioned with a minor road to its north-east, the A476 road to its north-west, a minor road and the A484 road to its south-west and the A4138 road to its east, and has the town of Llanelli surrounding it.

When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.

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. 48m) notation with 19m of drop, based on the 48m summit spot height that apperas on the Ordnance Survey 1:25,000 Explorer map and the 29m 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. 

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 resources made available online, and a variety of these refer to the area taking in this hill as Box Cemetery.

Therefore, the name this hill is now listed by in the 30-99m Twmpau is Box Cemetery, and this was derived from a variety of online sources. 

 

The full details for the hill are:

Group:  Mynydd Sylen

Name:  Box Cemetery

Previously Listed Name:  Pt. 48m 

OS 1:50,000 map:  159

Summit Height:  48.5m (LIDAR) 

Summit Grid Reference:  SN 52024 00937 & SN 52025 00938 & SN 52028 00939 & SN 52030 00937 (LIDAR)

Bwlch Height:  27.1m (LIDAR) 

Bwlch Grid Reference:  SN 52103 01769 (LIDAR) 

Drop:  21.4m (LIDAR) 

 

Myrddyn Phillips (October 2024)