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The Afon Clun is a long tributary of the River Ely ((ウェールズ語:Afon Elai)), in the counties of Cardiff and Rhondda Cynon Taf, Wales. Its bedrock is predominantly of sandstone. Beginning on the western slope of The Garth ((ウェールズ語:Mynydd y Garth)) the river is fast-flowing, in clear shallow water with a hard substrate, flowing to the south of Llantrisant and generally west to its confluence with the River Ely at Pontyclun, falling over its course. The river contains species such as stone loach, lamprey, eel, roach, chub and bullhead, and the Afon Clun valley is home to many species, including dragonflies and damselflies, badger, and the marsh fritillary butterfly, as well as the European Protected Species – bats, dormouse, otter and great crested newt. Birds in the area include bullfinch, kingfisher, linnet, reed bunting, skylark, and song thrush. The valley is at risk of flooding between Cross Inn and Pontyclun and is liable to overflow its northern bank along its one and a half mile (2.5 km) length downstream from the main A4119 (Tonypandy to Cardiff Bay ((ウェールズ語:Bae Caerdydd))) road at Talbot Green, ((ウェールズ語:Tonysguboriau)) to Pontyclun, providing a wetland wildlife habitat. Many archeological sites are close to the course of the river, from the Bronze Age tumuli on The Garth and an Iron Age hill fort at Rhiwsaeson, to the more recent industrial archeology of coal mines. ==Course== The Afon Clun, a major tributary of the River Ely, drains an area of to the north-west of Cardiff in south Wales.〔 〕 The river's source is on the western slope of The Garth ((ウェールズ語:Mynydd y Garth)) (elevation ), a mountain of pennant sandstone midway between Cardiff ((ウェールズ語:Caerdydd)) and Pontypridd, whose eastern slopes feed the River Taf by Taff's Well ((ウェールズ語:Ffynnon Taf)). The Garth stands in the north western corner of the City and County of Cardiff ((ウェールズ語:Dinas a Sir Caerdydd)), above the village of Gwaelod y Garth, about seven miles (11 km) north west of Cardiff city centre and a mile (1.6 km) north of Pentyrch. The lower northern slopes of The Garth form the boundary with Rhondda Cynon Taf, about half a mile (800 m) north of the Clun's source. To the east the land falls away sharply from the summit, dropping more than 650 feet (200 m) over a distance of . The drop is less dramatic on the western slopes, the source of the Clun, but the river still falls to by the time it crosses the county boundary into Rhondda Cynon Taf at Rhiwsaeson, just over two miles (3.5 km) from its source. The Clun is fast-flowing, with clear shallow water and a hard substrate (gravel/cobble/pebble). Near the Dŵr Cymru / Welsh Water water treatment plant at Rhiwsaeson the Afon Clun is fed from the north by Nant Myddlyn, which itself is joined from the east by Nant Dowlais. Nant Myddlyn rises in Tynant, Beddau about one and a half miles (2.5 km) to the north of its confluence with the River Clun, between Beddau and Llantwit Fardre ((ウェールズ語:Llanilltud Faerdref)), and Nant Dowlais rises in Church Village ((ウェールズ語:Pentre'r Eglwys)).〔NGR: ST086958679〕 Nant Dowlais also has a tributary, which rises on Garth Isaf, two and a quarter miles (3.5 km) from it on the north western slopes of The Garth and about half a mile (800 m) north of the Clun's source. Leaving Rhiwsaeson, about a mile (1.5 km) east of Cross Inn, the Clun widens to between about eight (2.5 m) and 12 feet (3.5 m) and slows. Here, where the Clun flows to the south of Cross Inn, as well as along the banks of Nant Dowlais and Nant Myddlyn, evidence of otter activity has been noted.〔 The river flows to the south of the A473 Pontypridd to Bridgend ((ウェールズ語:Penybont ar Ogwr)) road (Talbot Green By-Pass), where it is fed from the south by Nant Mwyndy. Nant Mwyndy flows over a bedrock of Carboniferous Limestone, rising in Creigiau and, flowing westwards, immediately north of Groesfaen, passing a small Industrial Estate at Mwyndy, feeding a lake resulting from Victorian opencast iron mining (see ''History'' below) and turning south to flow past Cefn-y-Parc Cemetery ((ウェールズ語:Mynwent Cefn-y-Parc)), Penygawsi, before reaching its confluence with the Afon Clun.〔(Location of Cefn-y-Parc Cemetery )〕 The Clun then flows beneath the main A4119 (Tonypandy to Cardiff Bay) route about south of the roundabout by Glamorgan Vale Retail Park, Talbot Green. At this point, the river often overflows onto the meadows to the north, providing a wetland wildlife habitat, although drainage of floodplain grasslands, for industrialisation, housing and associated infrastructure has had an impact on wildlife by reducing its available area.〔 〕 To the south, the enclosed woodland of Coed-yr-Hendy follows the river's course for its final half a mile (800 m). The woodland's gentle slope, up from the Clun towards Miskin ((ウェールズ語:Meisgyn)) and Pontyclun, prevents significant flooding over Afon Clun's southern bank. After passing Y Pant Comprehensive School and Pontyclun Fire Station, the Clun flows under the bridge built for the Llantrisant to Cowbridge ((ウェールズ語:Y Bont Faen)) main road, also known as the A4222, and gives its name to the nearby village, Pontyclun, which translates into English as 'the (river) Clun bridge'. Immediately past the bridge, from its source, is the Afon Clun's confluence with the River Ely, which heads south, east to Miskin, almost encircling Pontyclun, then south on its way to Cardiff, where it flows into Cardiff Bay by Penarth Marina, which flows into the Bristol Channel ((ウェールズ語:Môr Hafren)). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Afon Clun」の詳細全文を読む スポンサード リンク
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