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

Clogwyn Uchaf (SJ 262 459) 

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 LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Clogwyn Uchaf (SJ 262 459)

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. 

The hill is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its north-east and south, with the A539 road further to its south and the B5097 road further to its east, and has the village of Rhosllannerchrugog towards the east. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the accompanying Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.                                                                                                                       

When the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed under the point (Pt. 315m) notation with an estimated c 24m of drop based on the 315m summit spot height and an estimated c 291m bwlch height based on interpolation of 5m contouring between 290m – 295m that appear on the Ordnance Survey 1:25,000 Explorer map. 

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

As the summit of this hill comprises bounded land the details for it were examined on the Tithe map.  The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act.  This act allowed tithes to be paid in cash rather than goods.  The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land.  This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales. 

Extract from the Tithe map

The enclosed land where the summit of this hill is situated is given the number G37 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land.  The land where the summit of this hill is situated is named as Clogwyn Uchaf, with the details on the Tithe map appearing in the parish of Ruabon and in the county named as Denbigh. 

Extract from the apportionments

Therefore, the name this hill is listed by in the Y Trichant – The 300m Hills of Wales is Clogwyn Uchaf, and this was derived from the Tithe map. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Clogwyn Uchaf 

Previously Listed Name:  Pt. 315m 

OS 1:50,000 map:  117

Summit Height:  314.4m (LIDAR)                                                           

Summit Grid Reference:  SJ 26286 45940 (LIDAR) 

Bwlch Height:  289.5m (LIDAR) 

Bwlch Grid Reference:  SJ 26381 47029 (LIDAR) 

Drop:  25.0m (LIDAR) 

 

Myrddyn Phillips (April 2021)