Mapping Mountains – Significant Name Changes – 100m Twmpau

Coed Duon (SN 709 254)

There has been a Significant Name Change to a hill that is listed in the 100m Twmpau, with the summit height, its location and drop of the hill confirmed by LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Coed Duon

The criteria for the list 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 hill is adjoined to the Y Mynydd Du group of hills, which are situated in the north-western part of South Wales (Region C, Sub-Region C1), and is positioned with the Afon Sawdde and the A4069 road to its north-east, and has the village of Llangadog towards the north.

The hill originally appeared in the 100m P30 list on Geoff Crowder’s v-g.me website under the name of Quarry Wood, which is a name consistently given to a wooded area of land to the east of this hill on Ordnance Survey maps. 

Quarry Wood

136m

SN709254

146/160

12

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 summit of this hill has a wood on it which is not named on contemporary Ordnance Survey 1:25,000 Explorer maps, but the Ordnance Survey series of Six-Inch maps and the Interactive Coverage Map hosted on the Geograph website both name this wood as Coed Duon, and it is this wood that gives its name to the hill.

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

Extract from the Ordnance Survey series of Six-Inch maps

Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website

Therefore, as an appropriate name for the hill already exists on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website and on the series of Six-Inch maps this hill is now listed as Coed Duon in the 100m Twmpau.

The full details for the hill are:

Group:  Y Mynydd Du

Name:  Coed Duon

Previously Listed Name:  Quarry Wood 

  

OS 1:50,000 map:  146, 160

Summit Height:  135.1m (LIDAR)

Summit Grid Reference:  SN 70929 25448 (LIDAR)

Bwlch Height:  96.2m (LIDAR)

Bwlch Grid Reference:  SN 70653 25266 (LIDAR) 

Drop:  38.9m (LIDAR)

Myrddyn Phillips (March 2019)