Mapping Mountains – Significant Name Changes – The Welsh P15s

Dinas (SH 498 378) 

There has been a Significant Name Change to a hill that is listed in The Welsh P15s, 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 Dinas (SH 498 378)

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

The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10^th May 2019. 

The Welsh P15s by Myrddyn Phillips

The hill is adjoined to the Moel Hebog group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the A497 road to its north and a minor road to its south, and has the town of Cricieth surrounding it.

When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

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

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed under the point (Pt. 43m) notation with an estimated c 20m of drop, based on the 43m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map, and an estimated c 23m bwlch height, based on interpolation of 5m contouring between 20m – 25m. 

Extract from the Tithe 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 apportionments

The enclosed land where the summit of this hill is situated is given the number 576 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 Dinas in the apportionments, with the details on the Tithe map appearing in the parish of Cricieth and in the county named as Caernarfon. 

Extract from the Ordnance Survey series of Six-Inch maps

Therefore, the name this hill is now listed by in The Welsh P15s is Dinas and this was derived from the Tithe map.  This name compliments detail on the Ordnance Survey 1:25,000 Explorer map and the Ordnance Survey series of Six-Inch maps. 

 

The full details for the hill are: 

Group:  Moel Hebog 

Name:  Dinas

Previously Listed Name:  Pt. 43m 

OS 1:50,000 map:  123

Summit Height:  43.3m (LIDAR) 

Summit Grid Reference:  SH 49838 37808 (LIDAR)               

Bwlch Height:  25.5m (LIDAR) 

Bwlch Grid Reference:  SH 49941 37839 (LIDAR) 

Drop:  17.9m (LIDAR) 

 

Myrddyn Phillips (September 2024)