Mynydd Llangeinwyr is the highest
hill
A hill is a landform that extends above the surrounding terrain. It often has a distinct summit, and is usually applied to peaks which are above elevation compared to the relative landmass, though not as prominent as Mountain, mountains. Hills ...
in the county borough of
Bridgend
Bridgend (; or just , meaning "the end of the bridge on the Ogmore") is a town in the Bridgend County Borough of Wales, west of Cardiff and east of Swansea. The town is named after the Old Bridge, Bridgend, medieval bridge over the River Og ...
in the
coalfield
A coalfield is an area of certain uniform characteristics where coal is mined. The criteria for determining the approximate boundary of a coalfield are geographical and cultural, in addition to geological. A coalfield often groups the seams of ...
of South
Wales
Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
. It forms a long north–south ridge between the valleys of
Cwm Garw to the west and
Cwm Ogwr Fawr to the east. The highest point of the ridge is the 568-metre flat dome known as Werfa which is crowned by a
trig point
A triangulation station, also known as a trigonometrical point, and sometimes informally as a trig, is a fixed surveying station, used in geodetic surveying and other surveying projects in its vicinity.
The station is usually set up by a map ...
and prominent masts. A secondary trig point is sited at a height of 530 m near to the ancient cairn of Carn-yr-hyrddod. The hill is named from the village of
Llangeinor below its southern tip.
Geology
The hill is formed from
Pennant Sandstone
The Pennant Measures is the traditional name for a sequence of sedimentary rocks of the South Wales Coalfield. They were also referred to as the Upper Coal Measures and assigned to the Westphalian 'C' and Westphalian 'D' stages of the Carbonifer ...
overlying a thick suite of
South Wales Coal Measures rocks which have been heavily mined in the past. Many NW-SE aligned
faults cut through the area. Numerous small
landslip
Landslides, also known as landslips, rockslips or rockslides, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, mudflows, shallow or deep-seated slope failures and debris flows. Landslide ...
s affect the steeper slopes of the hill.
Access
Almost all of the upper slopes of the hill are mapped as
open country
"Open Country" is a designation used for some access land in England and Wales.
It was first defined under the National Parks and Access to the Countryside Act 1949 (and extended by the Countryside Act 1968), and was land over which an appropr ...
under the
Countryside and Rights of Way Act 2000
The Countryside and Rights of Way Act 2000 (c. 37), also known as the CRoW Act and "Right to Roam" Act, is a United Kingdom Act of Parliament affecting England and Wales which came into force on 30 November 2000.
Right to roam
The Act impleme ...
and thereby open to largely unfettered public access on foot. In addition numerous
public footpaths give access onto the hill from the communities in the surrounding valleys and a public bridleway runs southwest from the
A4107 road across the summit plateau then steeply down to
Blaengarw.
Geodesy
Werfa, under the name of Llangeinor, was the origin (meridian) for the 6 inch and 1:2500 Ordnance Survey maps of all the old Welsh counties except Pembroke, Denbigh and Flint: Anglesey, Carnarvon, Merioneth, Montgomery, Cardigan, Radnor, Carmarthen, Brecknock, Glamorgan and Monmouth. It also was the origin for Shropshire and Hereford.
[https://www.charlesclosesociety.org/files/153Meridians.pdf ]
References
{{reflist
External links
images of Mynydd Llangeinwyr and area on Geograph website
Mountains and hills of Bridgend County Borough