Wikipedia
Cwmdauddwr (rarely referred to by its correct full name of Llansanffraid Cwmteuddwr) is a village in Powys, Wales. It is contiguous with the town of Rhayader on the opposite side of the River Wye. The village is located on the B4518 road linking Rhayader with the Elan Valley Reservoirs.
The parish of Cwmdauddwr corresponds approximately to the medieval commote of Cwmwd Deuddwr . It was so called because of its location where the rivers Elan and Wye join. It has also been referred to as Elenydd and Elenid. It was in the area known as Rhwng Gwy a Hafren. It was also associated with Gwrtheyrnion on the east of the Wye, together they formed a cantref. This commote should not be confused with the commote of Deuddwr in Ystlyg which is also in Powys.
The village is home to a number of local shops, a pub (The Triangle Inn), village hall and a parish church dedicated to St Bride .
The Groe, a large park on the banks of the river, has walks, play areas and sports pitches.
Rhayader railway station was situated in the village until its closure in 1963.