Mapping Mountains – Significant Name Changes – Y Pedwarau

Garwyd (SH 996 459)

There has been a Significant Name Change to a hill that is listed in the Y Pedwarau – The 400m Hills of Wales, with the summit height, bwlch height, the drop and status of the hill confirmed by spot height data on the contemporary Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey series of Six-Inch maps

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

Y Pedwarau – The 400m Hills of Wales.  Welsh hills at or above 400m and below 500m in height with 30m minimum drop, the list is co-authored by Myrddyn Phillips and Aled Williams and is published on Mapping Mountains in Google Doc format.

The hill is adjoined to the Mynydd Hiraethog group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the A5 road and the Afon Ceirw to its south, and has the village of Cerrigydrudion towards the west north-west and the town of Corwen towards the east south-east.

The hill appeared in the original Welsh 400m P30 list on Geoff Crowder’s v-g.me website, under the name of Cader Dinmael, which is a name that appears close to this hill’s summit on contemporary Ordnance Survey maps.

Cader Dinmael

452m

SH997459

116

255/264

The composition of the name was amended to Cadair Dinmael to reflect the use of standard modern Welsh, however hill list authors are prone to list a hill by the name that appears nearest to its summit on contemporary Ordnance Survey maps, without much consideration for its local or historic confirmation, or whether map placement is appropriate.

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

Since publication of these P30 lists on Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map, and in the case of this hill it is the series of Ordnance Survey Six-Inch maps that shows the name of Garwyd being prioritised over that of Cadair Dinmael for this hill.

Extract from the Ordnance Survey series of Six-Inch maps

Therefore, the name this hill is now listed by in the Y Pedwarau is Garwyd, and its prioritised status was derived from the Ordnance Survey series of Six-Inch maps.

The full details for the hill are:

Group:  Mynydd Hiraethog

Name:  Garwyd

Previously Listed Name:  Cadair Dinmael

OS 1:50,000 map:  116

Summit Height:  452m (spot height)

Summit Grid Reference:  SH 99679 45910 (hand-held GPS via DoBIH)

Bwlch Height:  417m (spot height)

Bwlch Grid Reference:  SH 99413 46475 (spot height)

Drop:  35m

Myrddyn Phillips and Aled Williams (October 2019)