The Nant Llwydiarth is a small

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

Mid Wales Mid Wales ( cy, Canolbarth Cymru or simply ''Y Canolbarth'', meaning "the midlands") or Central Wales refers to a region of Wales, encompassing its midlands, in-between North Wales and South Wales. The Mid Wales Regional Committee of the Senedd ...

. It flows from the southern flank of

Mynydd Hendre-ddu Mynydd Hendre-ddu or Mynydd Hendreddu is a mountain in southern Snowdonia, Wales. It is one of a line of mountains running from Mynydd Dolgoed in the north, through Mynydd Llwydiarth to Mynydd Hendre-ddu and on to Mynydd y Foel, Y Grug, Mynydd Tri ...

down to Pont Cymerau, north-east of

Aberllefenni Aberllefenni is a village in the south of Gwynedd, Wales. It lies in the historic county of Merionethshire/ Sir Feirionnydd, in the valley of the Afon Dulas, and in the Community of Corris. Government The village has a community council. The ...

. Here it joins the

Nant Ceiswyn The Nant Ceiswyn (sometimes known as the ''Afon Ceiswyn'') is a small river in Mid Wales. It flows from the northern flank of Mynydd Dolgoed down to Pont Cymerau, north-east of Aberllefenni. Here it joins the Nant Llwydiarth to form the Afon Dula ...

to form the

Afon Dulas The Afon Dulas, or North Dulas, is a river forming the border between Merionethshire/Gwynedd and Montgomeryshire/Powys in Wales. Another river called Afon Dulas joins the Dyfi from the south, upstream of its confluence with the North Dulas: loca ...

that flows south to the Afon Dyfi. There was an ancient bridge at Pont Cymerau.

References

{{authority control Rivers of Gwynedd Rivers of Snowdonia Aberllefenni