Picws Du is the second highest peak of the Carmarthen Fans ( or ) in the

Carmarthenshire Carmarthenshire (; or informally ') is a Principal areas of Wales, county in the South West Wales, south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. ...

section of the Black Mountain in the west of the

Brecon Beacons National Park Brecon Beacons National Park, officially named Bannau Brycheiniog National Park (), is a National parks of the United Kingdom, national park in Wales. It is named after the Brecon Beacons (), the mountain range at its centre. The national park ...

in 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 ...

. The highest peak is

Fan Foel Fan commonly refers to: * Fan (machine), a machine for producing airflow, often used for cooling * Hand fan, an implement held and waved by hand to move air for cooling * Fan (person), short for fanatic; an enthusiast or supporter, especially with ...

immediately next along the ridge and it is a subsidiary summit of

Fan Brycheiniog Fan Brycheiniog is the highest peak at a height of (above sea level) in the Black Mountain (range), Black Mountain (''Y Mynydd Du'') region of the Brecon Beacons National Park in southern Wales. There is a trig point at the peak and on ...

. Picws Du falls within

Fforest Fawr Geopark Fforest Fawr Geopark is a Geopark in the Brecon Beacons National Park, south Wales. It is the first designated Geopark in Wales having gained membership of both the European Geoparks Network and the UNESCO-assisted Global Network of National G ...

and its prominent summit is marked by a large

Bronze Age The Bronze Age () was a historical period characterised principally by the use of bronze tools and the development of complex urban societies, as well as the adoption of writing in some areas. The Bronze Age is the middle principal period of ...

round barrow A round barrow is a type of tumulus and is one of the most common types of archaeological monuments. Although concentrated in Europe, they are found in many parts of the world, probably because of their simple construction and universal purpose. ...

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 A glacial lake is a body of water with origins from glacier activity. They are formed when a glacier erodes the land and then melts, filling the depression created by the glacier. Formation Near the end of the last glacial period, roughly 10,0 ...

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 The Cambrian Mountains (, in a narrower sense: ''Elenydd'') are a series of mountain ranges in Wales. The term ''Cambrian Mountains'' used to apply to most of the upland of Wales, and comes from the country's Latin name . Since the 1950s, it ...

Mynydd Epynt Mynydd Epynt () is an upland region of Mid Wales, within the county of Powys. It is bounded on the south by the upper stretch of the Usk Valley, on the north by the Irfon Valley, and on the east by the Wye Valley. Its western boundary is less ...

and

Brecon Brecon (; ; ), archaically known as Brecknock, is a market town in Powys, mid Wales. In 1841, it had a population of 5,701. The population in 2001 was 7,901, increasing to 8,250 at the 2011 census. Historically it was the county town of Breck ...

Swansea Swansea ( ; ) is a coastal City status in the United Kingdom, city and the List of urban areas in the United Kingdom, second-largest city of Wales. It forms a Principal areas of Wales, principal area, officially known as the City and County of ...

and the

Bristol Channel The Bristol Channel (, literal translation: "Severn Sea") is a major inlet in the island of Great Britain, separating South Wales (from Pembrokeshire to the Vale of Glamorgan) and South West England (from Devon to North Somerset). It extends ...

can just be seen on the

horizon The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This curve divides all viewing directions based on whethe ...

to the south, across the gently falling

dip slope A dip slope is a topographic or geomorphic surface which slopes in the same direction, and often by the same angle, as the true dip or apparent dip of the underlying strata.Jackson, JA, J Mehl and K Neuendorf (2005) ''Glossary of Geology.'' Ame ...

Pen y Fan Pen y Fan () is the highest peak in South Wales, situated in Brecon Beacons National Park (Bannau Brycheiniog). At above sea-level, it is also the highest British peak south of Cadair Idris in Snowdonia. It is the highest point (List of countie ...

and

Corn Du Corn Du is a summit of the twin topped Pen y Fan and the second highest peak in South Wales at 871.5 m (2,864 ft), situated in the Brecon Beacons National Park. It is situated to the south-west of Pen y Fan at a distance of approximate ...

are distinctive landmarks seen directly to the east across

Fforest Fawr Fforest Fawr (, ) is an extensive upland area in the county of Powys, Wales. Formerly known as the Great Forest of Brecknock in English, it was a royal hunting area for several centuries but is now used primarily for sheep grazing, forestry, wate ...

Geology

Picws Du is formed from the

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

s and

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, ...

s of the Brownstones Formation of the Lower

Old Red Sandstone Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the eastern seaboard of North America. It ...

laid down during the early

Devonian period The Devonian ( ) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago ( Ma), to the beginning of the succeeding C ...

. Its summit and southern slopes are formed from the hard-wearing sandstones of the overlying Pen y Fan Formation (formerly the Plateau Beds) which are of upper/late Devonian age. The northwestern and northeast faces of Picws Du were home to small glaciers during the ice ages which gouged out the

cirque A (; from the Latin word ) is an amphitheatre-like valley formed by Glacier#Erosion, glacial erosion. Alternative names for this landform are corrie (from , meaning a pot or cauldron) and ; ). A cirque may also be a similarly shaped landform a ...

s of Pwll yr Henllyn and Pant y Bwlch respectively. These cwms drain via the Afon Sawdde into the

River Towy The River Towy (, ; also known as the River Tywi) is one of the longest rivers flowing entirely within Wales. Its total length is . It is noted for its sea trout and salmon fishing. Route The Towy rises within of the source of the River Teif ...

to the west. The southern slopes drain into the

Afon Twrch The Afon Twrch is a river which rises in the Black Mountain in south Wales. It forms the boundary between Powys and Carmarthenshire and, downstream of Ystradowen, between Powys and Neath Port Talbot. Name The name derives from Welsh '' afon'' ...

and the slopes to the east so into the

River Tawe The River Tawe (; ) is a long river in South Wales. Its headwaters flow initially east from its source below Llyn y Fan Fawr south of Glasfynydd Forest, Moel Feity in the Black Mountain (range), Black Mountains, the westernmost range of the ...

. The

of Llyn y Fan Fach is situated below the summit to the west, and is only slightly smaller than its companion

Llyn y Fan Fawr is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog, the highest peak of the Black Mountain () range within the Brecon Beacons National Park. Created as a result of glacial action, it is one of the largest gl ...

about 2 miles to the east. There are several large linear

moraine A moraine is any accumulation of unconsolidated debris (regolith and Rock (geology), rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a gla ...

s below the cliffs, similar to that below

Fan Hir Fan Hir is a peak at the eastern end of the Black Mountain (range), Black Mountain (''Y Mynydd Du'') in the Brecon Beacons National Park (''Parc Cenedlaethol Bannau Brycheiniog'') in southern Wales. It is a subsidiary summit of Fan Brycheiniog. ...

, some of which retain small pools. Beneath the cliffs of the north face is an apron of talus which has been deeply gullied through the action of

debris flow Debris flows are geological phenomena in which water-laden masses of soil and fragmented Rock (geology), rock flow down mountainsides, funnel into stream channels, entrain objects in their paths, and form thick, muddy deposits on valley floors. ...

s, the site being reckoned as affording the best examples of such flows in Britain.

Archaeology

The summit hosts a very large

which is in a degraded state and remains unexcavated. It is likely to originate from the same period as burial cairns at the summits of

and

, when the

climate Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteoro ...

was much warmer than today, and the now deserted

sub-arctic The subarctic zone is a region in the Northern Hemisphere immediately south of the true Arctic, north of hemiboreal regions and covering much of Alaska, Canada, Iceland, the north of Fennoscandia, Northwestern Russia, Siberia, and the Cair ...

and tree-less landscape supported a larger human population than at present. There are several legends associated with the

below the summit, Llyn y Fan Fach, one of which is the story of the

Lady of the Lake The Lady of the Lake (, , , , ) is a title used by multiple characters in the Matter of Britain, the body of medieval literature and mythology associated with the legend of King Arthur. As either actually fairy or fairy-like yet human enchantres ...

Access

Usk reservoir with Black Mountain peaks - geograph

The entire mountain is open country and so freely accessible to walkers. The most popular approach includes a circuit of the neighbouring peaks of Waun Lefrith and Fan Foel. The high level route of the

Beacons Way The Beacons Way (Welsh: Ffordd y Bannau) is a waymarked long distance footpath in the Brecon Beacons National Park, Wales. It is a linear route which runs for east to west through the National Park, and passes many of the most important landmar ...

from

Llangadog Llangadog () is a village and community in Carmarthenshire, Wales, which also includes the villages of Bethlehem and Capel Gwynfe. A notable local landscape feature is Y Garn Goch with two Iron Age hill forts.The Welsh Academy Encyclopedia of ...

Abergavenny Abergavenny (; , , archaically , ) is a market town and Community (Wales), community in Monmouthshire, Wales. Abergavenny is promoted as a "Gateway to Wales"; it is approximately from the England–Wales border, border with England and is loca ...

runs over Picws Du whilst the low level route runs up to Llyn y Fan Fach and beside the Afon Sychlwch at the foot of its northern escarpment. The higher route follows the edge of the escarpment from near

, where the path climbs the escarpment from Llyn y Fan Fawr. Stone pavements have been added at especially wet parts of the path, where the path crosses

peat bog A bog or bogland is a wetland that accumulates peat as a deposit of dead plant materials often mosses, typically sphagnum moss. It is one of the four main types of wetlands. Other names for bogs include mire, mosses, quagmire, and muske ...

s. There is a well built stone staircase climbing the escarpment where the

rises from

. Access to the mountain is also possible from the car park at the foot of the road leading to the small dam on Llyn y Fan Fach. The road gives an easy but steep route to the lake. The footpath rises from the dam wall up the ridge to the east until it reaches the cliff above the lake. It then follows the cliff edge across Waun Lefrith to the summit, passing several rock

outcrops An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth and other terrestrial planets. Features Outcrops do not cover the majority of the Earth's land surface because in most p ...

and gullies dropping to the lake below. The views are extensive to the south with

visible as well as the

. Views to the north include Mynydd Epynt and Brecon, with

Llandeilo Llandeilo () is a town and Community (Wales), community in Carmarthenshire, Wales, situated where the River Towy is crossed by the A483 road, A483 on a 19th-century stone bridge. At the 2021 United Kingdom census, 2021 census the community had ...

and the Tywi valley to the west.

Wildlife

There are numerous different

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of bird in the area, and they include the

red kite The red kite (''Milvus milvus'') is a bird of prey in the family Accipitridae, which also includes many other Diurnality, diurnal Bird of prey, raptors such as eagles, buzzards, and harrier (bird), harriers. The species currently breeds only i ...

common buzzard The common buzzard (''Buteo buteo'') is a medium-to-large bird of prey which has a large range. It is a member of the genus '' Buteo'' in the family Accipitridae. The species lives in most of Europe and extends its breeding range across much of ...

kestrel The term kestrel (from , derivative from , i.e. ratchet) is the common name given to several species of predatory birds from the falcon genus ''Falco''. Kestrels are most easily distinguished by their typical hunting behaviour which is to hover ...

carrion crow The carrion crow (''Corvus corone'') is a passerine bird of the family Corvidae, native to western Europe and the eastern Palearctic. Taxonomy and systematics The carrion crow was one of the many species originally described by Carl Linnaeus ...

common raven The common raven or northern raven (''Corvus corax'') is a large all-black passerine bird. It is the most widely distributed of all Corvidae, corvids, found across the Northern Hemisphere. There are 11 accepted subspecies with little variatio ...

and

skylark ''Alauda'' is a genus of larks found across much of Europe, Asia and in the mountains of north Africa, and one of the species (the Raso lark) endemic to the islet of Raso in the Cape Verde Islands Cape Verde or Cabo Verde, officially ...

to name a few of the most obvious residents. The red kite was previously restricted to this and adjoining areas in

South Wales South Wales ( ) is a Regions of Wales, loosely defined region of Wales bordered by England to the east and mid Wales to the north. Generally considered to include the Historic counties of Wales, historic counties of Glamorgan and Monmouthshire ( ...

such as

Mynydd Mallaen Mynydd Mallaen () is an expansive plateau to the northwest of Cilycwm in northeast Carmarthenshire, Wales. It forms part of the Cambrian Mountains massif, and is north-west of the Black Mountain (range) in the Brecon Beacons. It takes the fo ...

, owing to persecution from farmers and

gamekeeper In the United Kingdom, a gamekeeper (often abbreviated to keeper) is a person who manages an area of countryside (e.g., areas of woodland, moorland, waterway or farmland) to make sure that there is enough Game (hunting), game for hunting, or fish ...

s who thought (wrongly) that the bird attacked

game bird Game or quarry is any wild animal hunted for animal products (primarily meat), for recreation (" sporting"), or for trophies. The species of animals hunted as game varies in different parts of the world and by different local jurisdictions, thou ...

s. The red kite has since been re-introduced widely in many parts of Britain, such as the Chilterns and

Northamptonshire Northamptonshire ( ; abbreviated Northants.) is a Ceremonial counties of England, ceremonial county in the East Midlands of England. It is bordered by Leicestershire, Rutland and Lincolnshire to the north, Cambridgeshire to the east, Bedfordshi ...

. The kestrel and buzzard are widely distributed, but the raven is mainly restricted to the higher mountains. There is a wide distribution of

mammals A mammal () is a vertebrate animal of the class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle e ...

such as

field vole The short-tailed field vole, short-tailed vole, or simply field vole (''Microtus agrestis'') is a grey-brown vole, around 10 cm in length, with a short tail. It is one of the most common mammals in Europe, with a range extending from the Atl ...

rabbit Rabbits are small mammals in the family Leporidae (which also includes the hares), which is in the order Lagomorpha (which also includes pikas). They are familiar throughout the world as a small herbivore, a prey animal, a domesticated ...

fox Foxes are small-to-medium-sized omnivorous mammals belonging to several genera of the family Canidae. They have a flattened skull; upright, triangular ears; a pointed, slightly upturned snout; and a long, bushy tail ("brush"). Twelve species ...

es,

weasel Weasels are mammals of the genus ''Mustela'' of the family Mustelidae. The genus ''Mustela'' includes the least weasels, polecats, stoats, ferrets, and European mink. Members of this genus are small, active predators, with long and slend ...

s and

badger Badgers are medium-sized short-legged omnivores in the superfamily Musteloidea. Badgers are a polyphyletic rather than a natural taxonomic grouping, being united by their squat bodies and adaptions for fossorial activity rather than by the ...

s as well as many

songbirds A songbird is a bird belonging to the suborder Passeri of the perching birds (Passerine, Passeriformes). Another name that is sometimes seen as the scientific or vernacular name is Oscines, from Latin ''oscen'', "songbird". The Passeriformes co ...

. The skylark is plentiful due to the extensive rough pasture present below the main peaks which allows ground nesting of the species. Pied wagtails are common near the streams and torrents running from the hill tops. The mountain tops are above the tree line, and

sessile oak ''Quercus petraea'', commonly known as the sessile oak, Welsh oak, Cornish oak, Irish oak or durmast oak, is a species of oak tree native to most of Europe and into Anatolia and Iran. The sessile oak is the national tree of Ireland, and an unof ...

is found clinging to the lower valley sides where they are sheltered from the winds. There are also a number of conifer forests maintained by

Natural Resources Wales Natural Resources Wales () is a Welsh Government sponsored body, which became operational from 1 April 2013, when it took over the management of the natural resources of Wales. It was formed from a merger of the Countryside Council for Wales, E ...

on the lower slopes.

References

{{Reflist

External links