Mapping Mountains – Hill Reclassifications – Humps

Garth Hill (SS 872 903) – Subhump reclassified to Hump

This is the fourteenth 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 the Ordnance Survey Six-Inch base maps available online, and for the reclassifications that affected the Humps the email sent to DJM&M was dated 15.10.12 and the details of this hill were then forwarded to Mark Jackson via email on the 06.12.12.

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 and the Ordnance Survey Six-Inch base maps available online, with these details being sent to Mark Jackson on 06.12.12.

Prior to this notification Mark Jackson had listed this hill with c 99m of drop based on the 257m 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 158m based on bwlch contouring at 10m intervals.  However, the variety of heights on both summit and bwlch on a number of Ordnance Survey different scaled maps indicated that this hill has 100m or more of drop which is sufficient for its reclassification to Hump status.

Extract from the Ordnance Survey Six-Inch map published in 1884

The hill is adjoined to the Y Cymoedd range of hills and is situated overlooking the A 4063 road and the Afon Llynfi which are to its west, with the town of Maesteg to the north-west of the hill.

The reclassification of this hill from Subhump to Hump status was accepted by Mark Jackson and its new classification augmented in to the listing of the Humps on the 08.12.12.

The full details for the hill are:

Name:  Garth Hill

Summit Height:  259m (as listed in the Humps)

OS 1:50,000 map:  170

OS 1:25,000 map:  166

Summit Grid Reference:  SS 87293 90322

Drop:  101m (as listed in the Humps)

Myrddyn Phillips (September 2017)