51°46′44″N 3°13′59″W / 51.779°N 3.233°W The Sirhowy Valley (Welsh: Glyn Sirhywi [1]) is an industrialised valley in the eastern part of the Valleys region of Wales. It is named from the Sirhowy River (Welsh: Afon Sirhywi) which runs through it. Its upper reaches are occupied by the town of Tredegar within the county borough of Blaenau Gwent. The valley initially runs south-southeast between the ridges of Cefn Manmoel to the east and Mynydd Bedwellte to the west before turning to a more southerly direction. Its central section is one of the least populated of the Welsh coalfield valleys. The valley enters the county borough of Caerphilly, which contains the towns of Blackwood (Welsh: Y Coed Duon) and Pontllanfraith. It then turns east and joins the valley of the Ebbw River, Ebbw Vale at Crosskeys.[2]
- ^ Hanes Tredegar o Ddechreuad y Gwaith Haiarn hyd yr Amser Presennol. David Morris (Eiddil Gwent, B.B.D.). Tredegar. 1868. https://kimkat.org/amryw/1_testunau/sion_prys_012_hanes-tredegar-1868_0082k.htm
- ^ Ordnance Survey 1:25,000 scale Explorer map sheets 152 Newport & Pontypool/Casnewydd a Phont-y-pŵl and 166 Rhondda & Merthyr Tydfil/Merthyr Tudful