Wednesday, 4 October 2017

Mapping Mountains – Hill Reclassifications – Y Pedwarau


Craig y Garreg Lwyd (SH 730 427) – 400m Sub-Pedwar reinstated to Pedwar

There has been a reclassification to the listing of Y Pedwarau due to a survey with a Leica GS15 conducted by John Barnard and Graham Jackson.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being reclassified from the 400m Sub-Pedwar categoryThe criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height that have 20m and more and below 30m of drop.

The name of the hill is Craig y Garreg Lwyd and prior to the survey with the Leica GS15 the hill was listed with 29.9m of drop based on a 473.4m (converted to OSGM15) summit and 443.5m (converted to OSGM15) bwlch height ascertained from a survey with the Trimble GeoXH 6000 and which resulted in this hill’s reclassification from a Pedwar to a 400m Sub-Pedwar.

Craig y Garreg Lwyd is situated in the Arenig range of hills with its Cardinal Hill being Graig Goch (SH 751 447) and is placed in the Region of North Wales (Region A, Sub-Region A3).  The hill is positioned overlooking the B 4391 which is to its south, with the communities of Llan Ffestiniog to the west south-west and Blaenau Ffestiniog to the north-west of the hill.

The hill is a part of designated open access land and can be accessed either from its south-west, south or south-east where tracks make their way toward the lower part of the hill.  However, the hills surrounding Craig y Garreg Lwyd are recommended to visit and so combining it with its near neighbours is worthwhile.

The survey with the Leica GS15 resulted in a summit height of 473.8m and a bwlch height of 443.6m, with these values giving this hill 30.2m of drop, which is sufficient for it to be re-instated as a Pedwar.


The full details for the hill are:

Cardinal Hill:  Graig Goch 

Summit Height:  473.8m (converted to OSGM15)

Name:  Craig y Garreg Lwyd

OS 1:50,000 map:  124

Summit Grid Reference:  SH 73047 42746

Drop:  30.2m (converted to OSGM15)


The total for Y Pedwarau is now 443 hills with eleven additions, and fifteen reclassifications to either 400m Sub-Pedwar status or 390m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 217 with 27 hills being added and 23 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Craig y Garreg Lwyd (SH 730 427) is now re-instated as a Pedwar


Myrddyn Phillips and Aled Williams (October 2017)

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