Mapping Mountains – Significant Name Changes – 100m Twmpau and Y Trechol – The Dominant Hills of Wales

 

Yr Arwydd (SH 472 854) 

There has been a Significant Name Change to a hill that is listed in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height and its location, the drop, dominance and status of the hill confirmed by a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Yr Arwydd (SH 472 854)

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

100m Twmpau - Welsh hills at or above 100m and below 200m in height with 30m minimum drop, with an accompanying sub list entitled the 100m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 100m and below 200m 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 100m Twmpau by Myrddyn Phillips

Y Trechol – The Dominant Hills of Wales – Welsh P30 hills whose prominence equal or exceed half that of their absolute height.  With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose prominence is between one third and half that of their absolute height.  The list is authored by Myrddyn Phillips with the Introduction to the start of the Mapping Mountains publication of this list appearing on the 3^rd December 2015, and which is now available in its entirety on Mapping Mountains in Google Doc format. 

Y Trechol - The Dominant Hills of Wales 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 has the A5025 road to its north-east and a minor road to its immediate south-east, and has the village of Llannerch-y-medd towards its west south-west and the village of Moelfre towards its east north-east. 

The hill originally appeared in the 100m P30 list on Geoff Crowder’s v-g.me website under the name of Mynydd Bodafon, with an accompanying note stating; aka Yr Arwydd.

Mynydd Bodafon

178m

SH472854

114

263

aka Yr Arwydd. Marilyn. Clem/Yeaman. Trig pillar.

 

During my early hill listing I paid little regard to name placement on the map, or the meaning of names and to what feature the name was appropriately applied to.  Therefore I prioritised names for listing purposes that I now understand are either inappropriate or where another name is viewed as being more appropriate. 

The two names of Yr Arwydd and Mynydd Bodafon are shown on the contemporary Ordnance Survey 1:25,000 Explorer map, with the former positioned adjacent to the summit of this hill.  The latter name is associated with the farms of Bodafon-y-glyn and Bodafon Wyn which are positioned westward from the summit of this hill.  The Tithe map indicates that Mynydd Bodafon is the mountain land associated with Bodafon farm that also takes in the other two adjacent P30s of Pen y Castell (SH 468 853) and Barclodiau (SH 466 848) and therefore this is a cynefin name, with the Six-Inch and 1:25,000 maps indicating that the name Yr Arwydd is associated with just that of this hill.  Therefore, as a hill name takes precedence over a cynefin name it is Yr Arwydd that is now being used for listing purposes for this hill. 

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

Therefore, the name this hill is now listed by in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales is Yr Arwydd, and this was derived from the contemporary 1:25,000 Explorer map, with the Ordnance Survey series of Six-Inch maps and the Tithe map also consulted. 

 

The full details for the hill are: 

Group:  Ynys Môn 

Name:  Yr Arwydd

Previously Listed Name:  Mynydd Bodafon 

OS 1:50,000 map:  114

Summit Height:  177.5m (converted to OSGM15)

Summit Grid Reference:  SH 47242 85417

Bwlch Height:  not applicable

Bwlch Grid Reference:  not applicable 

Drop:  177.5m

Dominance:  100.00%

 

Myrddyn Phillips (March 2021)