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River Giedd
The River Giedd (Welsh:Afon Giedd) is a principal tributary of the River Tawe, Wales. The river runs within the county of Powys and lies almost wholly within the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog). This river is perhaps unique in the British Isles in that there are in fact two separate rivers sharing the same name and occupying the same valley but which are not hydrologically connected. The upper Giedd rises on the southern slopes of the Old Red Sandstone mountain, Fan Brycheiniog in the Black Mountain (Y Mynydd Du) and heads south-southwest for about 3 km / 2 mi until, as it enters onto the Carboniferous Limestone outcrop it disappears into its bed. A dry valley continues in the same direction beyond the sinks and, as it crosses the Millstone Grit outcrop, gradually acquires a stream which is joined by others to become the lower Giedd. This separate river flows for about 6 km / 4 miles, passing the small village of Cwmgiedd, to i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afon Giedd Gorge - Geograph
This is a list of rivers of Wales, organised geographically. It is taken anti-clockwise from the Dee Estuary to the M48 Bridge that separates the estuary of the River Wye from the River Severn. Tributaries are listed down the page in an upstream direction, starting with those closest to the sea. The main stem (or principal) river of a catchment is given, left-bank tributaries are indicated by (L), and right-bank tributaries by (R). Note that, in general usage, the 'left (or right) bank of a river' refers to the left (or right) hand bank as seen when looking downstream. Where a named river is formed by the confluence of two differently named rivers, these are labelled as (Ls) and (Rs) for the left and right forks. A prime example is the formation of the River Taff from the Taf Fawr and the Taf Fechan at Cefn Coed-y-cymmer. The list includes more or less every watercourse named on Ordnance Survey mapping and thus many of the main rivers of Wales (as defined by Natural Resources Wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cwmgiedd
Cwmgiedd is a small village beside the River Giedd within the community of Ystradgynlais, Powys, Wales. It lies 22.5 km (15 miles) north-east of Swansea and 253 km (157 miles) west of London. ''The Silent Village'', a 1943 British propaganda film about the destruction by the Nazi occupiers of the Czech village Lidice, was filmed here. See also * John Thomas, Baron Thomas of Cwmgiedd * Swansea Valley The Swansea Valley ( cy, Cwm Tawe) is one of the South Wales Valleys. It is the valley from the Brecon Beacons National Park to the sea at Swansea of the River Tawe in Wales. Administration of the area is divided between the City and County of Sw ... References Villages in Powys {{Powys-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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, water catchment and recreation. It lies within the Brecon Beacons National Park. Extent The area extends from the edge of the Black Mountain in the west eastwards to the A470 Brecon to Merthyr Tydfil road, just west of the Brecon Beacons themselves. It includes the peaks of Fan Fawr (734 m), Fan Frynych (629 m), Craig Cerrig-gleisiad (629 m), Fan Llia (632 m), Fan Nedd (663 m), Fan Gyhirych (725 m), Fan Bwlch Chwyth (603 m) and Cefn Cul (562 m). Traditionally Fforest Fawr also included the peaks of Fan Hir and Fan Brycheiniog, although the modern recreational use of the name tends to be restricted to the area east of the Black Mountain of which they form a part. Geology The area is largely underlain by sandstones and mudstones of the Old ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Mountain (hill)
Twyn Llech, also known as Black Mountain, is a mountain in the Black Mountains. It is the only Marilyn to fall exactly on the Welsh–English border, straddling Brecknockshire (currently administered as part of the unitary authority of Powys) and Herefordshire. Its parent peak, Waun Fach, lies to the west. Access The Black Mountain is the highest point on Hatterrall Ridge. Offa's Dyke Path passes along the ridge, more or less from south to north. A steeper path leads to the summit from near the former youth hostel in the Vale of Ewyas to the west. The summit is unmarked and, because of the very shallow gradients along the summit ridge, virtually impossible to determine ''in situ''. Open access to all the moorland here means that deviation from the paths is allowed. The ground is peaty and normally very wet even in good weather, especially on the highest ground. It is the highest summit in England south of Great Whernside in the Yorkshire Dales, even though higher neighbour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dan-yr-Ogof
Dan yr Ogof (), at the National Showcaves Centre for Wales, is a long cave system in south Wales, about north of Ystradgynlais and southwest of Brecon, in the Brecon Beacons National Park. It is the main feature of a show cave complex, which is claimed to be the largest in the UK and is a tourist attraction in Wales. The first section of the cave system is open to the public, but the extensive cave system beyond is scheduled as a national nature reserve and is open only to ''bona fide'' cavers. The bones of some 42 humans, as well as numerous animal bones, have been found in one of the nearby chambers of this cave system. In a 2005 poll of ''Radio Times'' readers, Dan yr Ogof was named as the greatest natural wonder in Britain. Exploration The cave was first explored in 1912 by three local brothers, Edwin, Tommy and Jeff Morgan, using candles and primitive equipment. Completely unsure of what they would discover, they armed themselves with a revolver. Edwin was the firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dye Tracing
Dye tracing is a method of tracking and tracing various flows using dye as a flow tracer when added to a liquid. Dye tracing may be used to analyse the flow of the liquid or the transport of objects within the liquid. Dye tracking may be either qualitative, showing the presence of a particular flow, or quantitative, when the amount of the traced dye is measured by special instruments. Fluorescent dyes Fluorescent dyes are often used in situations where there is insufficient lighting (e.g., sewers or cave waters), and where precise quantitative data are required (measured by a fluorometer). In 1871, Fluorescein was among the first fluorescent dyes to be developed. Its disodium salt (under the trademark " Uranine") was developed several years later and still remains among the best tracer dyes.An educational website about karst and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swansea Valley
The Swansea Valley ( cy, Cwm Tawe) is one of the South Wales Valleys. It is the valley from the Brecon Beacons National Park to the sea at Swansea of the River Tawe in Wales. Administration of the area is divided between the City and County of Swansea, Neath Port Talbot County Borough, and Powys. A distinction may be drawn between the Lower Swansea valley and the Upper Swansea valley; the former was more heavily industrialised during the 19th and 20th centuries. Settlements and transport Towns and villages include, Clydach, Pontardawe, Ystradgynlais, Ystalyfera and Abercraf. In its September 2005 document ''Towards a Valleys Strategy'', Neath Port Talbot County Borough Council noted that a marked divide between the more remote communities at Ystalyfera and along the Twrch and Amman valleys and the reasonably prosperous southern communities of Pontardawe, Alltwen, Rhos, and Trebanos. The area has had no rail connection since passenger services on the Swansea Vale Railway lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ystradgynlais
Ystradgynlais (, ) is a town on the River Tawe in southwest Powys, Wales. It is the second-largest town in Powys and is in the historic county of Brecknockshire. The town has a high proportion of Welsh language-speakers. The community includes Cwmtwrch, Abercraf and Cwmgiedd, with a population of 8,092 in the 2011 census. It forms part of the Swansea Urban Area where the Ystradgynlais subdivision has a population of 10,248. History The place-name Ystradgynlais, meaning 'vale of the river Cynlais' – Cynlais may be a personal name, or derive from ''cyn'' ('chisel') and ''glais'' ('stream') – is first recorded in 1372. In the 1600s there were only a couple of houses by the church and a pub (now the rectory). In 1801 there were only 993 residents in the town living in only 196 houses. The first documented written evidence of iron working in the area was at Ynyscedwyn and is of a deed of release dated 1729. By 1750 there were seven furnaces in south Wales, one of which was at Y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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