Afon Llynfi (Wye)
The Afon Llynfi is a short river in the county of Powys, south Wales. A tributary of the River Wye, it runs approximately south to north just to the west of the Black Mountains and partly within the Brecon Beacons National Park.
Geography
The river rises as a small stream to the west of the village of Bwlch and flows north for two miles into Llangorse Lake. It leaves the lake just to the southwest of the village of Llangors and follows a course past the hamlets of Trefecca and Tredustan. The river then travels between the twin villages of Talgarth and Bronllys, forming the boundary of the national park in part. It then flows northeast past the village of Three Cocks before entering the River Wye just upstream of Glasbury Bridge.The Afon Llynfi is joined by a number of tributary streams including the Tawel and Gwlithen on its left bank and the Nant Cwy and Nant yr Eiddil on its right bank. The two largest tributaries are those of the Dulas which enters on the left just above Bronllys Castle Bridge and the River Ennig which enters just downstream on the opposite bank, having flowed through Talgarth. The publicly accessible falls at Pwll y Wrach on this tributary are a local attraction.