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

Pt. 86.4m (SH 482 875) 

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 Pt. 86.4m (SH 482 875)

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 with 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. 

The 30-99m Twmpau by Myrddyn Phillips

The hill is adjoined to the Ynys Môn group of hills which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the coast to its north-east, the A5025 road to its south-west and a minor road to its south-east, and has the village of Moelfre towards the east south-east. 

The hill appeared in the original 30-99m Welsh P30 list on Geoff Crowder’s v-g.me website under the transposed name of Pen-yr-allt, with an accompanying note stating; Name from buildings to the North-East.

Pen-yr-allt

86m

SH484876

114

263

Name from buildings to the North-East

 

During my early hill listing I thought it appropriate to either invent a name for a hill, or use a name that appeared near to the summit of the hill on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them or as in this instance transpose the name of a farm and use it for that of the hill.  This is not a practice that I now advocate as with time and inclination place-name data can be improved either by asking local people or by examining historic documents, through this form of research an appropriate name for the hill can usually be found.  

Extract from the Ordnance Survey 1:25,000 Explorer map

However, even when research is conducted an appropriate name for the hill may not be found, and on such occasions, including for this hill the listing protocol is to use the point (Pt. 86.4m) notation. 

Therefore, the name this hill is now listed by in the 30-99m Twmpau is Pt. 86.4m, and this is being used as the author has not found an appropriate name for the hill either through historic research and / or local enquiry. 

 

The full details for the hill are: 

Group:  Ynys Môn 

Name:  Pt. 86.4m

Previously Listed Name:  Pen-yr-allt 

OS 1:50,000 map:  114

Summit Height:  86.4m (LIDAR) 

Summit Grid Reference:  SH 48231 87520 (LIDAR)               

Bwlch Height:  57.0m (LIDAR) 

Bwlch Grid Reference:  SH 47995 86997 (LIDAR) 

Drop:  29.4m (LIDAR) 

 

Myrddyn Phillips (September 2021)