Pen Allt-mawr

Last updated • 1 min readFrom Wikipedia, The Free Encyclopedia

Pen Allt-mawr
Enalltfawr.JPG
Pen Allt-mawr from Pen Cerrig-calch
Highest point
Elevation 719 m (2,359 ft)
Prominence 103 m (338 ft)
Parent peak Waun Fach
Listing Hewitt, Nuttall, HuMP
Coordinates 51°54′42″N3°09′16″W / 51.9118°N 3.1544°W / 51.9118; -3.1544
Naming
English translationtop of the big slope
Language of name Welsh
Geography
Location Black Mountains, South Wales
OS grid SO206243
Topo map OS Landranger 161
Listed summits of Pen Allt-mawr
NameGrid refHeightStatus
Pen Twyn Glas SN969193 646 metres (2,119 ft)sub Hewitt, Nuttall

Pen Allt-mawr is a 719 metres (2,359 ft) high subsidiary summit of Waun Fach and the third highest peak in the Black Mountains in south-eastern Wales. A very recognisable and prominent peak of the Black Mountains, it lies near the end of the more westerly of Waun Fach's two broad southern ridges. Its top Pen Twyn Glas is to the north, while its close neighbour Pen Cerrig-calch is to the south. [1] A prominent spur 1 km to the SSW of the summit is known as Pen Gloch-y-pibwr. The stepped Bryniog ridge curves southward from this point.

Contents

Its summit is stony and has damaged Bronze Age cairns and a large shelter cairn together with a trig point. [2] Further Bronze Age cairns are found along the western edge of the plateau to the south.

Geology

The summit of Pen Allt-mawr is at the northern tip of a broadly triangular summit surface formed from a slab of southerly tilting upper Old Red Sandstone traditionally known as the Quartz Conglomerate. These rocks which date from the Late Devonian Epoch are continuous with those of Pen Cerrig-calch but other than a tiny outlier forming the summit of Sugar Loaf, are found nowhere else within the Black Mountains. Beneath the Quartz Conglomerate are the Early Devonian sandstones of the Brownstones Formation which form the upper slopes and summits of Pen Twyn Glas and Mynydd Llysiau to the north (though are barely seen). More readily eroded mudstone bands within this formation give rise to the stepped appearance of this hill and many of its neighbours. Sandstones of the Senni Formation (traditionally the 'Senni Beds') form the lower slopes of the mountain. [3]

Related Research Articles

<span class="mw-page-title-main">Black Mountain (hill)</span> Mountain (703.6m) on Wales-England border, UK

The Black Mountain, is a mountain in the Black Mountains. It is the only Marilyn to fall exactly on the Welsh–English border, Powys and Herefordshire. Its parent peak, Waun Fach, lies to the west.

<span class="mw-page-title-main">Black Mountains, United Kingdom</span> Region of hills in Wales and England

The Black Mountains are a group of hills spread across parts of Powys and Monmouthshire in southeast Wales, and extending across the England–Wales border into Herefordshire. They are the easternmost of the four ranges of hills that comprise the Brecon Beacons national park, and are frequently confused with the westernmost, which is known as the Black Mountain. The Black Mountains may be roughly defined as those hills contained within a triangle defined by the towns of Abergavenny in the southeast, Hay-on-Wye in the north and the village of Llangors in the west. Other gateway towns to the Black Mountains include Talgarth and Crickhowell. The range of hills is well known to walkers and ramblers for the ease of access and views from the many ridge trails, such as that on the Black Hill in Herefordshire, at the eastern edge of the massif. The range includes the highest public road in Wales at Gospel Pass, and the highest point in southern England at Black Mountain.

<span class="mw-page-title-main">Waun Fach</span> Mountain in Wales

Waun Fach is, with a summit height of 811 metres (2,661 ft), the highest mountain in the Black Mountains in south-eastern Wales. It is one of the three Marilyns over 600 m that make up the range, the others being Black Mountain and Mynydd Troed. To the north Rhos Fawr and the Radnor Forest can be seen. It is the third highest mountain in Britain south of Snowdonia. It is situated at the head of the Grwyne Fechan valley, above and to the west of the Grwyne Fawr reservoir. It has an undistinguished rounded summit. The nearby tops on the ridge, Pen Trumau and Pen y Gadair Fawr, although lower, are very much more recognisable.

<span class="mw-page-title-main">Crug Hywel</span> Summit hillfort in south Wales

Crug Hywel is an Iron Age Celtic hillfort, with a clearly visible earth and stone ditch and rampart. Crug Hywel is approached by a couple of public footpaths across farmland from Crickhowell and Llanbedr and visited by the Beacons Way. It lies within an area designated as open country over which the public have the right to roam.

<span class="mw-page-title-main">Fan Brycheiniog</span> Hill (801.7m) in Powys, Wales

Fan Brycheiniog is the highest peak at a height of 802.5 metres (2,633 ft) in the Black Mountain region of the Brecon Beacons National Park in southern Wales. There is a trig point at the peak and on the edge of the escarpment, and nearby, a stone shelter with an inner seat. It lies just inside the historic county of Brecknockshire which gives the mountain its Welsh name. A subsidiary top, less than a kilometre from the summit along the ridge to the northwest, is the highest point of the neighbouring county of Carmarthenshire. Fan Brycheiniog is also within the Fforest Fawr Geopark designated in 2005 in recognition of the area's geological heritage. The views of the moorland and open country to the north are spectacular when the weather is clear, and reveals the isolation of the range, especially when compared with the more popular Pen y Fan range to the east.

<span class="mw-page-title-main">Black Mountain (range)</span> Mountain range, west of Brecon Beacons, Wales

The Black Mountain is a mountain range in South, Mid and West Wales, straddling the administrative boundary between Carmarthenshire and Powys and forming the westernmost range of the Brecon Beacons National Park. Its highest point is Fan Brycheiniog at 802 metres or 2,631 ft. The Black Mountain also forms a part of the Fforest Fawr Geopark.

<span class="mw-page-title-main">Fan y Big</span> Hill (716.7m) in Powys, Wales

Fan y Big is a subsidiary summit of Waun Rydd in the Brecon Beacons National Park, in southern Powys, Wales. It is 716.6 m (2,351 ft) high and is often hiked as part of the Horseshoe Walk, a traverse of the four main peaks in the Brecon Beacons.

<span class="mw-page-title-main">Pen y Gadair Fawr</span> Mountain (800m) in Powys, Wales

Pen y Gadair Fawr is an 800 metres (2,625 ft) high subsidiary summit of Waun Fach and the second highest peak in the Black Mountains in south-eastern Wales. Marked by a medium-sized cairn, it is a much more distinguished top than its parent 1.5 km to the northwest. Its 658 metres (2,159 ft) high top Pen Twyn Mawr is about 2 km to the southeast.

<span class="mw-page-title-main">Beacons Way</span> Long distance path in mid wales

The Beacons Way is a waymarked long distance footpath in the Brecon Beacons National Park, Wales. It is a linear route which runs for 99 miles (159 km) east to west through the National Park, and passes many of the most important landmarks and mountain peaks in the mountain range. It also includes a few of the towns in the park as well as popular attractions such as Carreg Cennen Castle near Llandeilo at the western end of the path.

<span class="mw-page-title-main">Pen Cerrig-calch</span> Mountain (701m) in Powys, Wales

Pen Cerrig-calch is a subsidiary summit of Waun Fach in the Black Mountains in the Brecon Beacons National Park in southern Powys, Wales. Its summit, at a height of 701 m (2,300 ft), is marked by a trig point. The peak sits high above the River Usk valley as it narrows above the small town of Crickhowell. The views from here are wide-ranging and extend as far as the Beacons themselves to the west. A ridge runs off to the northwest and the shoulder of Pen Gloch-y-pibwr then turns north to the secondary top of Pen Allt-mawr whose peak at 719m is also crowned by a trig point.

<span class="mw-page-title-main">Grwyne Fawr</span> River in south Wales

The Grwyne Fawr is a river in the Brecon Beacons National Park in south Wales. A section of it forms the administrative border between Powys and Monmouthshire and also of the historic counties of Brecon and Monmouth. The river and its major tributary the Grwyne Fechan flow into the River Usk at Glangrwyney.

<span class="mw-page-title-main">Allt yr Esgair</span> Hill (392.6m) in Powys, Wales, UK

Allt yr Esgair is a hill in the Brecon Beacons National Park in Powys, Wales. It is commonly referred to locally as simply 'The Allt'. The Welsh name signifies 'wooded slope of the ridge'. It takes the form of a northwest-southeast aligned ridge which rises to a height of 393m and which overlooks the valley of the River Usk to the west and south. To the northeast are panoramic views across Llangorse Lake to the Black Mountains There is a viewfinder on the summit erected as a monument to Eirene Lloyd White, Baroness White of Rhymney. It is a Marilyn with a prominence of 199 metres.

<span class="mw-page-title-main">Picws Du</span> Mountain (749.1m) in Carmarthenshire, Wales

Picws Du is the second highest peak of the Carmarthen Fans in the Carmarthenshire section of the Black Mountain in the west of the Brecon Beacons National Park in south Wales. The highest peak is Fan Foel immediately next along the ridge and it is a subsidiary summit of Fan Brycheiniog. Picws Du falls within Fforest Fawr Geopark and its prominent summit is marked by a large Bronze Age round barrow at a height of 2457 feet above sea level. Waun Lefrith is the other, lower summit of the Carmarthen Fans situated to the west. The peak overlooks the glacial lake of Llyn y Fan Fach in the cwm below. As the peak sits on the edge of the escarpment on a ridge which juts out into the valley below, the views from the summit are panoramic and extensive. The views to the north are especially impressive when the weather is clear, looking towards the Cambrian Mountains, Mynydd Epynt and Brecon. Swansea and the Bristol Channel can just be seen on the horizon to the south, across the gently falling dip slope. Pen y Fan and Corn Du are distinctive landmarks seen directly to the east across Fforest Fawr.

<span class="mw-page-title-main">Pen Twyn Mawr</span> Hill (658m) in Powys, Wales

Pen Twyn Mawr is a top of Pen y Gadair Fawr in the Black Mountains in south-eastern Wales. It lies on one of the many south ridges of Waun Fach.

<span class="mw-page-title-main">Chwarel y Fan</span> Mountain (679m) in Monmouthshire, Wales

Chwarel y Fan is a peak in the Black Mountains in south-eastern Wales. It is the highest rise on the long ridge which extends southeastwards from Rhos Dirion. The ridge continues southeastwards to the lesser summit of Bal-Mawr whose top is adorned by a trig point at 607 metres (1,991 ft) above sea level. About one km (0.62 mi) southeast along the ridge is the lesser top of Bal-Bach at a height of just over 520 metres (1,710 ft). Chwarel y Fan is the county top of the historic county of Monmouthshire, and is also the highest point in the current local government area of Monmouthshire.

<span class="mw-page-title-main">Mynydd Llysiau</span> Mountain (663m) in Powys, Wales

Mynydd Llysiau is a subsidiary summit of Waun Fach in the Black Mountains in south-eastern Wales. It lies halfway between Waun Fach and Pen Allt-mawr. It is a distinguished summit with a steep eastern face.

<span class="mw-page-title-main">Pen Twyn Glas</span> Hill (646m) in Powys, Wales

Pen Twyn Glas is a top of Pen Allt-mawr in the Black Mountains in south-eastern Wales. It lies in between Pen Allt-mawr and Mynydd Llysiau.

<span class="mw-page-title-main">Gaer (Black Mountains)</span> Hill in the Black Mountains of Wales

Gaer is the name of a hill in the Black Mountains of the Brecon Beacons National Park in Monmouthshire, south Wales. It lies at the southern end of the long ridge between the valley of the Grwyne Fawr and the Vale of Ewyas one mile to the north of Bryn Arw and 3 miles northeast of Sugarloaf. Its summit at 427m above sea level sits within an Iron Age hillfort known as Twyn y Gaer.

<span class="mw-page-title-main">Mynydd Troed</span> Hill (609m) in Powys, Wales

Mynydd Troed is a hill in the Black Mountains of the Brecon Beacons National Park in Powys, south Wales. Its name literally translates to "Foot Mountain," based how it appears when viewed from the Allt Mawr ridge.

References

  1. Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN   1-85284-304-7.
  2. "Pen Alltmawr Cairn II (502375)". Coflein. RCAHMW . Retrieved 17 May 2020.
  3. "England and Wales sheet 214 'Talgarth'". Maps portal. British Geological Survey. Retrieved 17 May 2020.