Tuesday, 28 June 2016

Mapping Mountains – Significant Name Changes – Y Pellennig, Yr Uchafion and 600m Twmpau


Bwa’r Llyn (SN 798 214)

This is the sixth post under the heading of Significant Name Changes, and the following details are in respect of a hill that was surveyed with the Trimble GeoXH 6000 on the 14th April 2014.

The hill is situated in Y Mynydd Du, which is a group of hills forming the western part of the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog), and is relatively remote for a Welsh hill with the nearest towns being Ystradgynlais to the south and Llanymddwfri (Landovery) to the north.

Bwa'r Llyn (SN 798 214)

The hill first made an appearance in a hill list in the late 1920’s when Arthur St George Walsh listed it as Bannau Sir Gaer, and was also included by Ted Moss as Banau Sir Gaer Point W in The Two-Thousands of Wales in the 1940 Rucksack Club Journal.

Unfortunately these early listings are now almost forgotten, but their use of 50ft, either as a prominence value or as a single ring contour, has been used in more recent times in its 15m whole numbered metric equivalent, one example being by John and Anne Nuttall within their guide to The Mountains of England and Wales Volume 1 Wales.  However, this hill was not included in their first edition to the Welsh mountains and was only later included due to details sent them after a rudimentary survey of the hill had taken place.

This hill’s prominence was surveyed using a rudimentary staff five times over four visits, with the details forwarded to John and Anne Nuttall who subsequently surveyed the hill using their own rudimentary method.  Importantly the details of the surveys were sent to John and Anne under the hill name of Waun Lefrith, which is the name that appears closest to this hill’s summit on Ordnance Survey maps of the day.

This hill’s inclusion as a Nuttall was confirmed via a letter and it made its appearance under the name of Waun Lefrith in the 2nd Edition of their guide which was published in 1999.

Hill list authors are prone to list a hill by the name that appears nearest to its summit on Ordnance Survey maps, without much consideration for its local or historical confirmation.  However, place-name data can be improved by asking local people and examining historical documents, and since this hill’s inclusion as a Nuttall extensive place-name research has taken place for Y Mynydd Du and the details included in Y Pellennig – The Remotest Hills of Wales. 

The name used for this hill in Y Pellennig – The Remotest Hills of Wales (Europeaklist, Haroldstreet, v-g.me and Mapping Mountains 2015) is Bwa’r Llyn.  This name is based on local enquiry and historical Ordnance Survey maps.

   
The full details for the hill are:

Group:  Y Mynydd Du

Name:  Bwa’r Llyn

Previously Listed Name:  Waun Lefrith 

Summit Height:  676.2m (converted to OSGM15)

OS 1:50,000 map:  160

Summit Grid Reference:  SN 79820 21451 
 
Drop:  15.9m




Myrddyn Phillips and Aled Williams (June 2016)


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