The Afon Dulas, or North Dulas, is a

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

forming the border between

Merionethshire Merionethshire, or Merioneth ( or '), was Historic counties of Wales, one of the thirteen counties of Wales that existed from 1536 until their abolishment in 1974. It was located in the North West Wales, north-west of Wales. Name 'Merioneth' is a ...

Gwynedd Gwynedd () is a county in the north-west of Wales. It borders Anglesey across the Menai Strait to the north, Conwy, Denbighshire, and Powys to the east, Ceredigion over the Dyfi estuary to the south, and the Irish Sea to the west. The ci ...

and

Montgomeryshire Montgomeryshire ( ) was Historic counties of Wales, one of the thirteen counties of Wales that existed from 1536 until their abolishment in 1974. It was named after its county town, Montgomery, Powys, Montgomery, which in turn was named after ...

Powys Powys ( , ) is a Principal areas of Wales, county and Preserved counties of Wales, preserved county in Wales. It borders Gwynedd, Denbighshire, and Wrexham County Borough, Wrexham to the north; the English Ceremonial counties of England, ceremo ...

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

. Another river called Afon Dulas joins the Dyfi from the south, upstream of its

confluence In geography, a confluence (also ''conflux'') occurs where two or more watercourses join to form a single channel (geography), channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main ...

with the North Dulas: locally this is referred to as the South Dulas.

Route of North Dulas

Afon Dulas 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 Machynlleth () is a market town, community and electoral ward in Powys, Wales and within the historic boundaries of Montgomeryshire. It is in the Dyfi Valley at the intersection of the A487 and the A489 roads. At the 2001 Census it had a po ...

History

The Dulas is recorded as an important land boundary in 1200, in a document written in 1428. This document describes the land owned by Einion ap Seisyllt, in the time of

Llywelyn the Great Llywelyn ab Iorwerth (, – 11 April 1240), also known as Llywelyn the Great (, ; ), was a medieval Welsh ruler. He succeeded his uncle, Dafydd ab Owain Gwynedd, as King of Gwynedd in 1195. By a combination of war and diplomacy, he dominate ...

, as "tota terra inter aquas de Dyfi et Delwas" (Latin, meaning: all the land between the rivers Dyfi and Dulas).

Roads and railways in the Dulas valley

* 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

Tributaries

* Nant Garfan * Nant Lliwdy south of Pantperthog * Nant y Darren at Pantperthog * Nant Cwm Cadian north of Pantperthog * Afon Glesyrch at Esgairgeiliog * Nant y Goedwig south of Maespoeth Junction * Afon Deri (formerly known as Afon Corris) at Corris * Afon Llefenni at Aberllefenni * Nant Llwydiarth at Pont Cymerau, Aberllefenni *

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 ...

at Pont Cymerau, Aberllefenni

South Dulas

It rises in Glaslyn, below the slopes of Foel Fadian, and passes the

hamlet ''The Tragedy of Hamlet, Prince of Denmark'', often shortened to ''Hamlet'' (), is a Shakespearean tragedy, tragedy written by William Shakespeare sometime between 1599 and 1601. It is Shakespeare's longest play. Set in Denmark, the play (the ...

Forge A forge is a type of hearth used for heating metals, or the workplace (smithy) where such a hearth is located. The forge is used by the smith to heat a piece of metal to a temperature at which it becomes easier to shape by forging, or to the ...

and Plas Dolguog before joining the Dyfi. Close to its confluence with the Dyfi it is crossed by the

Cambrian The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordov ...

rail line on a bridge known as the Black Bridge. After the line had been repeatedly closed due to flooding after heavy rain, in 2021 it was announced that the bridge and its approaches were to be raised by a metre to try and alleviate the problem. Work began on 15 May and was due to be completed by 28 June.

Tributaries

* Afon Crewi at Felingerrig

References

{{Authority control Dulas Dulas Dulas