Mapping Mountains – Hill Reclassifications – Y Trichant – The 300m Hills of Wales

Ffridd Maes Mawr (SH 781 091) – Trichant deletion

There has been a deletion based on confirmation of the higher summit position to the list of 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 detail on contemporary maps produced from Ordnance Survey data. 

The criteria for the list that this deletion 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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Ffridd Maes Mawr, and it is adjoined to the Aran Fawddwy group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with minor roads to its north and west, the A487 road farther to its west and the A470 road to its east, and has the village of Aberllefenni towards the north-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 category with an accompanying note stating; 375m on 1984 1:50,000 map at GR784091, as detail on Ordnance Survey 1:25,000 Explorer maps was prioritised over detail on Ordnance Survey 1:50,000 Landranger maps. 

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 with the summit for the qualifying P30 relocated, resulting in this hill being listed with 15m of drop, based on the 371m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 356m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

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

Therefore, the deletion of this hill from Trichant status is due to detail on contemporary maps produced from Ordnance Survey data confirming the adjacent hill positioned at SH 783 090 as higher, resulting in a 371m summit height and a 356m bwlch height, with these values giving this hill 15m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Aran Fawddwy 

Name:  Ffridd Maes Mawr 

OS 1:50,000 map:  124

Summit Height:  371m (spot height)                                                           

Summit Grid Reference:  SH 78197 09198 (spot height) 

Bwlch Height:  356m (spot height) 

Bwlch Grid Reference:  SH 78262 09153 (spot height) 

Drop:  15m (spot height summit and bwlch) 

 

Myrddyn Phillips (February 2022)