Pt. 118.9m (SN 710 294)
There has been a Significant Name Change to a hill that is listed in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Pt. 118.9m (SN 710 294) |
The criteria for the two listings that this name
change applies to are:
100m Twmpau - Welsh hills at or above 100m and below 200m in height that have 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.
100m Twmpau by Myrddyn Phillips |
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 start of the Mapping Mountains publication of this list appearing on the 3rd
December 2015, and the list is now available in its entirety on Mapping Mountains in Google Doc format.
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
The hill is adjoined to the Mynydd
Du group of hills, which are situated in the southern
part of South Wales (Region B, Sub-Region B5), and it is positioned with the Afon Tywi (River Towy)
and the A40 road to its west, the B4069 road to its east, and has the village
of Llangadog towards the south.
The hill appeared in the
original Welsh 100m P30 list on Geoff Crowder’s v-g.me website, under the invented
and transposed name of Allt y Tyddyn,
with an accompanying note stating; Name
from farm to the North.
Allt y Tyddyn | 119m | SN711294 | 146/160 | 12 | Name from farm to the North |
During my early hill listing I thought it
appropriate to either invent a name for a hill, or use a name that appeared
near to the summit of the hill on Ordnance Survey maps of the day. My preference was to use farm names and put Pen, Bryn
or Moel in front of them or as in
this instance transpose the name of a farm and add the words Allt y to it. This is not a practice that I now advocate as
with time and inclination place-name data can be improved either by asking
local people or by examining historic documents, through this form of research
an appropriate name for the hill can usually be found.
Extract from the Ordnance Survey 1:25,000 Explorer map |
However, on occasion even when research is
conducted an appropriate name for the hill may not be found, and on such
occasions the listing protocol is to use the point (Pt. 118.9m) notation, and
for this hill this is such an example.
Therefore, the name this hill
is now listed by in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales is
Pt. 118.9m, and this is being used as the
author has not found an appropriate name for the hill either through historic
research and/or local enquiry.
The full details for the hill are:
Group: Mynydd Du
Name: Pt. 118.9m
Previously Listed Name:
Allt y Tyddyn
OS 1:50,000 map: 146,
160
Summit Height: 118.9m (LIDAR)
Summit Grid Reference: SN 71046 29411 (LIDAR)
Bwlch Height: 69.9m (LIDAR)
Bwlch Grid Reference: SN 72466 30393 (LIDAR)
Drop: 48.9m (LIDAR)
Dominance: 41.16% (LIDAR)
Myrddyn Phillips (April
2024)
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