Mapping Mountains – Significant Name Changes – Y Trichant – The 300m Hills of Wales

Coed Mawr (SH 815 118) 

There has been a Significant Name Change to a hill that is listed in the Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data. 

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

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is adjoined to the Aran Fawddwy 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 A470 road to its east and north, the A487 road to its west and a minor road to its south, and has the small town of Dinas Mawddwy towards the north-east. 

The hill appeared in the original Welsh 300m P30 list on Geoff Crowder’s v-g.me website, under the transposed name of Mynydd Gartheiniog, with an accompanying note stating; Name from hill ridge to the North.

Mynydd Gartheiniog

378m

SH815118

124/125

23

Name from hill ridge to the North

 

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.  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

As the accompanying note implied, the name of Mynydd Gartheiniog is more appropriately applied to the land accommodating a ridge to the north of this hill.  With historical and contemporary maps giving the main named feature of this hill as Coed Mawr. 

Therefore, the name this hill is now listed by in the Y Trichant – The 300m Hills of Wales is Coed Mawr, and this was derived from the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. 

 

The full details for the hill are: 

Group:  Aran Fawddwy 

Name:  Coed Mawr 

Previously Listed Name:  Mynydd Gartheiniog 

OS 1:50,000 map:  124, 125

Summit Height:  378m (spot height)                                                           

Summit Grid Reference:  SH 81552 11887 (spot height) 

Bwlch Height:  c 336m (interpolation) 

Bwlch Grid Reference:  SH 81350 12450 (interpolation) 

Drop:  c 42m (spot height summit and interpolated bwlch) 

 

Myrddyn Phillips (January 2022)