Gwastedyn (SN 986 661)
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, bwlch height and their locations, the drop, dominance and status
of the hill confirmed by LIDAR analysis initially conducted by Aled Williams.
LIDAR image of Gwastedyn (SN 986 661) |
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, with
the Introduction to the Mapping Mountains publication of this list appearing on
the 3rd December 2015.
The hill is adjoined
to the Hirddywel group of hills, which are situated in the north-eastern part of Mid and West Wales
(Region B, Sub-Region B1), and it is
positioned with the A44 road to its north-east and the A470 road to its south-west,
and has the town of Rhaeadr Gwy (Rhayader) towards the north-west.
The hill appeared in the original Welsh 400m P30
list on Geoff Crowder’s v-g.me website under the name of Gwastedyn Hill, which is a prominent name that appears beside the
summit of this hill on contemporary Ordnance Survey maps. This is also the name the hill was listed by
in the 1st edition of the Y
Pedwarau published by Europeaklist in May 2013.
Extract from the Ordnance Survey 1:25,000 Explorer map |
Since publication of the
1st edition of Y Pedwarau 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. Two of the historic maps now available are the
Ordnance Survey Draft Surveyors map which formed the basis for the first
publicly available Ordnance Survey One-Inch ‘Old Series’ map and the latter map
and the Ordnance Survey Six-Inch map form the basis for the change in this
hill’s listed name.
Extract from the Ordnance Survey One-Inch 'Old Series' map |
The One-Inch ‘Old
Series’ map was the first map that the Ordnance Survey produced, and their
publication culminated from the whole of Britain being surveyed between 1791
and 1874 and the detail gathered therein produced at a scale of one inch to the
mile and published in sheet format between 1805 and 1874. The One-Inch ‘Old Series’ maps for the whole
of Wales are now available online; they are also available in map format as
enlarged and re-projected versions to match the scale and dimensions of the
Ordnance Survey 1:50,000 Landranger series and are published by Cassini. This series of maps form another important
part in the study of Welsh upland place-names and bridge the timeframe leading
up to the production of the Ordnance Survey base map of the Six-Inch series,
and it is these two maps that use the form of this hill’s name without the word
Hill, which is a relatively recent
map addition.
Extract from the Ordnance Surveys series of Six-Inch maps |
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 Gwastedyn and this form without the superfluous use of the
word Hill was derived from the
Ordnance Survey One-Inch ‘Old Series’ map and the Ordnance Survey series of Six-Inch
maps and substantiated by the 1865 Enclosure Map.
The full details for the
hill are:
Group: Hirddywel
Name: Gwastedyn
Previously Listed
Name: Gwastedyn Hill
OS 1:50,000 map: 136, 147
Summit Height: 477.2m (LIDAR)
Summit Grid
Reference: SN 98679 66145 (LIDAR)
Bwlch Height: 233.1m (LIDAR)
Bwlch Grid
Reference: SN 99395 68804 (LIDAR)
Drop: 244.1m (LIDAR)
Dominance: 51.15% (LIDAR)
Myrddyn Phillips and
Aled Williams (November 2019)
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