Mapping Mountains – Hill Reclassifications – Y Pellennig – The Remotest Hills of Wales

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM PELLENNIG STATUS

Pt. 526.8m (SN 745 611) – Pellennig addition

There has been an addition to the listing of Y Pellennig – The Remotest Hills of Wales due to a survey conducted with the Trimble GeoXH 6000 and analysis of bwlch contouring on OS Maps, with the criteria for this list being:

Y Pellennig – The Remotest Hills of Wales - Welsh hills whose summit is at least 2.5km from the nearest paved public road and the hill has a minimum 15m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and is available as a downloadable e-booklet or print-booklet version on Mapping Mountains Publications with the up-to-date master list available on the Mapping Mountains site in Google Doc format.

Pt. 526.8m (SN 745 611)

As the authors do not know an appropriate name for the hill it is being listed by the point (Pt. 526.8m) notation and prior to the Trimble GeoXH 6000 survey this hill was listed with c 13m of drop, based on the 527m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 514m bwlch height based on interpolation of bwlch contouring between 510m – 520m.

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

The hill is situated in the Elenydd group of hills which are placed in the Mid and West Wales Region (Region B, Sub-Region B2), and it is positioned in relatively remote land for Wales and has the small community of Pontrhydfendigaid towards the north-west and Tregaron towards the west.

As the hill is a part of designated open access land it can be approached from any direction, for those wishing to do so an approach from open hillside to the south is probably the most convenient as its eastern slopes are still immersed in conifer plantation.

The addition of this hill to Pellennig status is reliant upon the survey result produced by the Trimble GeoXH 6000 and interpolation of bwlch contouring on the OS Maps website.  This mapping gives contour intervals at 5m and therefore narrows down the interpolated height of the bwlch, this is now estimated to be c 511m based on contouring between 510m – 515m coupled with the result of a Trimble GeoXH 6000 survey taken from near the critical bwlch, this survey produced a 511.9m height, but when doing so the authors judged land to the south-east to be lower on the hill to hill traverse, and therefore this hill is being listed with a 526.8m (converted to OSGM15) summit height and an interpolated bwlch height of c 511m, and as the nearest paved public road is 2.700km from the summit of this hill these values are sufficient for it to be classified as a Pellennig.

Extract from OS Maps

The full details for the hill are:

Group:  Elenydd

Summit Height:  526.8m (converted to OSGM15)

Name:  Pt. 526.8m

OS 1:50,000 map:  146, 147

Summit Grid Reference:  SN 74595 61119  

 

Drop:  c 16m

Remoteness:  2.700km

The Trimble GeoXH 6000 gathering data at the summit of Pt. 526.8m

For the additions and deletions to Y Pellennig – The Remotest Hills of Wales reported on Mapping Mountains please consult the following Change Register:

Y Pellennig – The Remotest Hills of Wales

Myrddyn Phillips and Aled Williams (October 2018)