Mapping Mountains – Significant Name Changes – Y Pedwarau – The 400m Hills of Wales and Y Trechol – The Dominant Hills of Wales

Mynydd Epynt (SN 961 464)

There has been a Significant Name Change to a hill that is listed in the Y Pedwarau – The 400m Hills of Wales and Y Trechol – The Dominant Hills of Wales, with the summit height and position derived from initial LIDAR analysis conducted by Aled Williams and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams, and the bwlch height and its location, the drop, dominance and status of the hill determined from map contour interpolation.

Mynydd Epynt (SN 961 464)

The criteria for the two listings 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.

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 Mapping Mountains publication of this list appearing on the 3rd December 2015, and which is now available in its entirety on Mapping Mountains in Google Doc format.

The hill is adjoined to the Mynydd Epynt group of hills, which are situated in the south-eastern part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with the B4519 road to its north-east, and has the small community of Garth to the north and Capel Uchaf (Upper Chapel) to the south-east.

The hill appeared in the original Welsh 400m P30 list on Geoff Crowder’s v-g.me website, under the name of Mynydd Epynt, which is a prominent name on contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps and which is associated with this hill range.

Extract from the Ordnance Survey 1:50,000 Landranger map

The hill was listed in the 1^st edition of the Y Pedwarau published by Europeaklist in May 2013 under the name of Clepyn Melyn with an accompanying symbol giving that this name was sourced from local enquiry.

The name Clepyn Melyn applies to a patch of land near to the summit of this hill, and as such this name was used for that of the hill as it was considered its main named feature.  However, since publication of the 1^st edition of Y Pedwarau by Europeaklist a number of names have been under review, including this one, and as the summit of this hill is the highest part of the entire mountain known as Mynydd Epynt this name is now preferred to that previously used.

Therefore, the name this hill is now listed by in the Y Pedwarau – The 400m Hills of Wales and Y Trechol – The Dominant Hills of Wales is Mynydd Epynt, and this was derived from contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps.

The full details for the hill are:

Group:  Mynydd Epynt

Name:  Mynydd Epynt

Previously Listed Name:  Clepyn Melyn

OS 1:50,000 map:  147

Summit Height:  475.7m (converted to OSGM15)

Summit Grid Reference:  SN 96124 46428

Bwlch Height:  c 278m (interpolation)

Bwlch Grid Reference:  SN 84063 43279 (interpolation)

Drop:  c 198m (Trimble summit and interpolated bwlch)

Dominance:  41.62% (Trimble summit and interpolated bwlch)

For details on the summit survey of this hill

Myrddyn Phillips and Aled Williams (January 2020)