Llyn y Fan Fawr

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Llyn y Fan Fawr
Llyn y Fan Fawr.jpg
Powys UK relief location map.jpg
Red pog.svg
Llyn y Fan Fawr
Location Powys, Wales
Coordinates 51°52′52″N3°42′0″W / 51.88111°N 3.70000°W / 51.88111; -3.70000
Type natural
Primary outflows Nant y Llyn, tributary of River Tawe
Basin  countriesUnited Kingdom
Surface elevation605 m (1815 feet)

Llyn y Fan Fawr ( Welsh for 'great lake (near) the peak') [1] is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog, [2] the highest peak of the Black Mountain (Y Mynydd Du) range within the Brecon Beacons National Park. Created as a result of glacial action, [3] it is one of the largest glacial lakes in southern Wales. [4] The lake is roughly rectangular in shape with its long axis oriented roughly north–south.[ citation needed ]

The lake from a small beach Llyn y Fan Fawr from a small beach.jpg
The lake from a small beach

The surface of Llyn y Fan Fawr lies at about 1815 feet or 605m above sea level. [5] [6] Its primary outflow is to the River Tawe. [7] Much of the land around the lake is peaty and thus wet underfoot.

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The Brecon Beacons, or Bannau Brycheiniog, is a mountainous region and national park in Wales. The name 'Brecon Beacons' was originally applied only to the mountain range south of Brecon, Powys, which is now also known as the Central Beacons. The range includes South Wales' highest mountain, Pen y Fan, its twin summit Corn Du, and Craig Gwaun Taf, which are the three highest peaks in the range.

<span class="mw-page-title-main">Pen y Fan</span> Welsh mountain peak of the Brecon Beacons, Powys

Pen y Fan is the highest peak in South Wales, situated in Brecon Beacons National Park. At 886 metres (2,907 ft) above sea-level, it is also the highest British peak south of Cadair Idris in Snowdonia. It is the highest point of the historic county of Brecknockshire. The twin summits of Pen y Fan and Corn Du at 873 metres (2,864 ft) were formerly referred to as Cadair Arthur or 'Arthur's Seat'.

<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 neighboring 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 county 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.

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Fan Fawr is a mountain in the Fforest Fawr section of the Brecon Beacons National Park, in Powys, Wales and over 734 m (2,408 ft) high.

<span class="mw-page-title-main">Fforest Fawr</span> Upland area in Powys, Wales

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, water catchment and recreation. It lies within the Brecon Beacons National Park.

<span class="mw-page-title-main">Fan Llia</span> Mountain (631.9m) in Powys, Wales

Fan Llia is a subsidiary summit of Fan Fawr in the Fforest Fawr section of the Brecon Beacons National Park, Wales. In common with other peaks in the Fforest Fawr uplands it lies within the county of Powys.

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Fan Hir is a peak at the eastern end of the Black Mountain in the Brecon Beacons National Park in southern Wales. It is a subsidiary summit of Fan Brycheiniog. It falls within the county of Powys and is also a part of the traditional area of Fforest Fawr. Its Welsh name means "long peak", a fitting description, particularly if seen from the east when its steep eastern face is seen to advantage. It is about 2.5 miles or 4 km long and faces east. Its summit is 2490 feet above sea level. Fan Hir is separated from its higher neighbour to the north-west, Fan Brycheiniog by a col known as Bwlch Giedd, where a path rises from Llyn y Fan Fawr via a stone staircase.

<span class="mw-page-title-main">Afon Tarell</span> River in United Kingdom, Wales

The Afon Tarell is a river in Powys, Wales, which rises to the west of the Brecon Beacons in Brecon Beacons National Park and flows north, then north-east, for 12 miles (20 km) into the River Usk.

<span class="mw-page-title-main">Llyn Cwm Llwch</span> Small lake in Wales

Llyn Cwm Llwch is a small lake or pool in the Brecon Beacons National Park in Powys, Wales. It is between 1 and 2 acres: much smaller than the two glacial lakes in the west of the Black Mountain (range): Llyn y Fan Fawr and Llyn y Fan Fach, and one of the few natural bodies of water in the park. It is of glacial origin, occupying a rock hollow beneath the peaks of Pen y Fan and Corn Du in the central Brecon Beacons. It is drained by the Nant Cwm Llwch which empties into the Afon Tarell, which itself enters the River Usk at Brecon. Tommy Jones' obelisk, a memorial in granite to a young boy who died near this spot in 1900, overlooks the lake.

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<span class="mw-page-title-main">Waun Lefrith</span> Hill (676.1m) in Carmarthenshire, Wales

Waun Lefrith is a top of Picws Du and is also the westernmost of the Carmarthen Fans, a group of peaks within the Black Mountain of the Brecon Beacons National Park. It lies within Carmarthenshire, Wales. The summit plateau of the mountain reaches a height of 2221 feet above sea level. Picws Du and Fan Foel are the other, higher summits of the Carmarthen Fans. The glacial lake of Llyn y Fan Fach dominates the panorama to the north of the peak. Beyond the lake to the north lies the Usk Reservoir and then the Cambrian Mountains on the horizon. Swansea Bay and the Bristol Channel are visible to the south across the undulating dip slope of the mountain. The Towy (Tywi) valley lies to the west, with Llandovery and Llandeilo as important market towns nearest to the hills.

<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 Bannau Sir Gâr / 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.

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This article describes the geology of the Brecon Beacons National Park in mid/south Wales. The area gained national park status in 1957 with the designated area of 1,344 km2 (519 sq mi) including mountain massifs to both the east and west of the Brecon Beacons proper. The geology of the national park consists of a thick succession of sedimentary rocks laid down from the late Ordovician through the Silurian and Devonian to the late Carboniferous period. The rock sequence most closely associated with the park is the Old Red Sandstone from which most of its mountains are formed. The older parts of the succession, in the northwest, were folded and faulted during the Caledonian orogeny. Further faulting and folding, particularly in the south of the park is associated with the Variscan orogeny.

The bedrock geology of Carmarthenshire in west Wales consists largely of Palaeozoic age sedimentary rocks. Unconsolidated deposits of Quaternary age in Carmarthenshire include a dissected cover of glacial till, valley floor alluvium and some scattered peat deposits in both upland and lowland settings. There are extensive beach and tidal flat deposits along the Carmarthenshire coast. The exploitation of the county's mineral riches, particularly coal and limestone, was a key part of the local economy through much of the nineteenth and twentieth centuries.

References

  1. Owen, Hywel Wyn; Morgan, Richard (2007). Dictionary of the Place-names of Wales (First ed.). Llandysul: Gomer Press. p. 300. ISBN   9781843239017.
  2. Andrew Davies; David Whittaker (9 September 2010). Walking on the Brecon Beacons. Cicerone Press Limited. pp. 191–. ISBN   978-1-84965-346-6.
  3. Geological Survey of Great Britain (1932). Memoirs. England and Wales: Explanation of Sheet. H.M. Stationery Office.
  4. Derek Ratcliffe (26 January 2012). A Nature Conservation Review: Volume 1: The Selection of Biological Sites of National Importance to Nature Conservation in Britain. Cambridge University Press. pp. 236–. ISBN   978-0-521-20329-6.
  5. Hans Luther; Julian Rzóska (1971). Project Aqua: A Source Book of Inland Waters Proposed for Conservation . International Biological Programme. ISBN   978-0-632-08730-3.
  6. Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'
  7. Bye-gones: Relating to Wales and the Border Counties. Printed at the Caxton works. 1894. pp. 504–.