Afon Dulas

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The Dulas as it passes through Aberllefenni

The Afon Dulas (also referred to as the North Dulas) is a river forming the border between Merionethshire/Gwynedd and Montgomeryshire/Powys in Wales.


It rises from a source in the hills above Aberllefenni and passes through Corris, Esgairgeiliog and Pantperthog before joining the Afon Dyfi at Ffridd Gate near Machynlleth.

Roads and Railways in the Dulas valley[edit]

  • The A487 trunk road follows the valley from Ffridd Gate to Corris
  • The Roman road Sarn Helen probably followed the valley from Aberllefenni to Ffridd Gate
  • The Corris Railway ran through the valley from Aberllefenni to Ffridd Gate


  • Nant Ralltgoed (also known as Nant Ceiswyn)
  • Afon Llefenni
  • Afon Deri (formerly known as Afon Corris)
  • Nant y Goedwig
  • Afon Glesyrch
  • Nant y Cadian
  • Nant y Darren

South Dulas[edit]

Another river also called the Afon Dulas joins the Dyfi from the south, upstream of its confluence with the North Dulas. Locally this is referred to as the South Dulas. It rises in Glaslyn, below the slopes of Foel Fadian, and passes the hamlet of Forge and Plas Dolguog before joining the Dyfi.

Coordinates: 52°36′00″N 3°50′30″W / 52.6001°N 3.8418°W / 52.6001; -3.8418