Mapping Mountains – Hill Reclassifications – Marilyns

Mynydd Anelog (SH 151 272) – Submarilyn reclassified to Marilyn

This is one in a series of retrospective Hill Reclassification posts that detail hills whose status has altered in the listing of the Welsh Marilyns.  These reclassification posts will give details of hills where I have had direct association with their change of status, and they will tie in with a forthcoming Change Register giving detail to this list and its alterations since publication in the TACit Tables booklet

The listing of Welsh Marilyns was published in booklet format by TACit Tables in February 1997 and entitled The Hewitts and Marilyns of Wales.  The Marilyns were originally listed as an all British compilation and were published by Cicerone Press in 1992 in the book entitled The Relative Hills of Britain.  The list compiler for the Marilyns is Alan Dawson.

When the Welsh Marilyns list was published in booklet format there were 156 qualifying hills with a further 27 Welsh Submarilyns also included.  The criteria for Marilyn status being any hill that has a drop of at least 150m, irrespective of their height, with the criteria for Submarilyn being any hill that has 140m or more and below 150m of drop.

The Hewitts and Marilyns of Wales by Alan Dawson

The details for the hill reclassification appear below:

The name of the hill is Mynydd Anelog, and it is situated in the Pen Llŷn group of hills in the north-western part of Wales, and is positioned with minor roads to its south and east, with the B4413 road further to its east, and has the coast to its immediate west and the small community of Aberdaron towards the east south-east.

Prior to this hill’s reclassification to Marilyn status it was listed as a Submarilyn with an estimated c 149m of drop, based on the 192m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated bwlch height of c 43m.

The Leica GS15 set-up position at the bwlch of Mynydd Anelog

As its c 149m listed drop was near the benchmark value of 150m it was prioritised for a GNSS survey and this took place on the 12^th July 2013.  The summit and bwlch of this hill were surveyed by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica GS15 with an hour of data collected at the summit, with Enid Parr, Jeff Parr and Chris Watson also in attendance, resulting in a 191.4m summit height and a 40.4m bwlch height, with these values giving this hill 151.0m of drop.

The Leica GS15 set-up position at the summit of Myndd Anelog

The reclassification of this hill from Submarilyn to Marilyn status was accepted by the list author; Alan Dawson, and its new classification augmented in to the listing of Marilyns in July 2013.

The full details for the hill are:

Name:  Mynydd Anelog

OS 1:50,000 map:  123

OS 1:25,000 map:  253

Summit Height:  191.4m (converted to OSGM15)

Summit Grid Reference:  SH 15193 27218

Bwlch Height:  40.4m (converted to OSGM15)

Bwlch Grid Reference:  SH 17347 28960

Drop:  151.0m

Myrddyn Phillips (February 2020)