Mapping Mountains – Hill Reclassifications – Humps

Fan (SN 672 316) – Subhump addition

This is the eleventh in a series of Hill Reclassification posts that detail hills whose status has been altered in the listing of the Humps (HUndred Metre Prominences) through map study and / or surveys that I have instigated.

This and forthcoming posts are retrospective as many of these hill reclassifications were initiated from studying the Ordnance Survey enlarged mapping that is hosted on the Geograph website, and for the reclassifications that affected the Humps the email I posted on the RHB Yahoo Group forum in relation to this hill was dated 28.05.12.

The listing of Humps was published in book format by Lulu in 2009 and entitled More Relative Hills of Britain, its author; Mark Jackson gives credit to a number of people who contributed toward the formation of this list, these include; Eric Yeaman, Alan Dawson, Clem Clements, Rob Woodall, Bernie Hughes, Pete Ridges and others.  When the list was published in book format there were 2987 Humps listed with their criteria being any British hill that has 100m or more of drop, accompanying the main list is a sub category entitled Subhumps, with the criteria being any British hill that has 90m or more and below 100m of drop.

More Relative Hills of Britain by Mark Jackson

The details for the reclassification appear below:

There has been a reclassification to the listing of the Humps (HUndred Metre Prominences) due to consulting the Ordnance Survey enlarged mapping that is hosted on the Geograph website, with these details being posted on the RHB Yahoo Group forum on 28.05.12.

Prior to this notification Mark Jackson had listed this hill with c 89m of drop based on the 265m spot height given to a triangulation pillar on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated bwlch height of c 176m based on bwlch contouring at 10m intervals.  The summit area of this hill has two uppermost 260m contour rings with the easterly one being where the 265m trig pillar is positioned, whilst the westerly one is given a 267m summit spot height on the Ordnance Survey enlarged mapping hosted on the Geograph website, this when coupled with an estimated bwlch height of 174m – 175m gives this hill sufficient drop for it to be classified as a Subhump.

Extract from the Ordnance Survey 1:25,000 Explorer map showing the 265m spot height adjoined to the trig pillar on the eastern 260m contour ring

Extract from the Ordnance Survey enlarged mapping hosted on the Geograph website showing the 267m summit spot height on the western 260m ring contour

The hill is adjoined to the Mynydd Mallaen group of hills and is situated overlooking the Afon Tywi (River Towy) and the village of Llangadog to its south-east and the village of Llanwrda to its east.

The addition of this hill to Subhump status was accepted by Mark Jackson and its new classification augmented in to the listing of the Humps on the 19.07.12.

The full details for the hill are:

Name:  Fan

Summit Height:  267

OS 1:50,000 map:  146

OS 1:25,000 map:  12, 186

Summit Grid Reference:  SN 67221 31601

Drop:  c 92 (as listed in the Humps)

Myrddyn Phillips (September 2017)