For the tributary of the River Aeron

River Aeron

The River Aeron is a small river in Ceredigion, Wales, that flows into Cardigan Bay at Aberaeron. It is also referred to on some older maps as the River Ayron.- Source :...

, see Gwenffrwd, Aeron

Gwenffrwd, Aeron

The Gwenffrwd is a right-bank tributary of the River Aeron in Ceredigion, mid Wales. From its source, east of the hamlet of Bethania, it flows generally southwards to meet the Aeron near Capel Betws Lleucu, southwest of the village of Llangeitho....

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The Gwenffrwd is a right-bank tributary of the River Towy in northern Carmarthenshire

Carmarthenshire

Carmarthenshire is a unitary authority in the south west of Wales and one of thirteen historic counties. It is the 3rd largest in Wales. Its three largest towns are Llanelli, Carmarthen and Ammanford...

, mid Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. It rises to the east of Carn Nant-yr-ast and flows in a generally southeasterly direction to its confluence with the Towy, 1 mile to the northwest of the village of Rhandirmwyn. Its only significant tributary is the Nant Melyn which enters on its right-bank.