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River Dyfi
Afon Dyfi
Afon Dyfi - geograph.org.uk - 242012.jpg
The River Dyfi north of Machynlleth
Physical characteristics
SourceCreiglyn Dyfi
 - elevation1,900 ft (580 m)
 - location
Irish Sea

The River Dyfi (Afon Dyfi in Welsh) is a river in Mid Wales. The Dyfi estuary forms the border between the counties of Gwynedd and Ceredigion.


The River Dyfi rises in the small lake Creiglyn Dyfi at about 1,900 feet (580 m) above sea level, below Aran Fawddwy, flowing south to Dinas Mawddwy and Cemmaes Road, then south west past Machynlleth to Cardigan Bay at Aberdyfi. It shares its watershed with the River Severn and the River Dee before flowing generally south-westwards down to a wide estuary. The only large town on its route is Machynlleth.

Because of its origins high in the Cambrian Mountains and its relatively short length, it is prone to flooding and some roads in the lower catchment can become impassable during very wet weather. It has been a relatively pristine river with few polluting inputs and is notable for its Salmon and Sea trout (migratory Brown trout).[1]

The catchment area was notable for its now defunct lead mines and slate quarries, especially around Corris and Dinas Mawddwy.


The River Dyfi is joined by the rivers:

Pont ar Ddyfi[edit]

The road bridge which crosses the river north of Machynlleth is considered a landmark.[2]

Dyfi Biosphere[edit]

The area around Aberystwyth and the Dyfi Valley is known as the Dyfi Biosphere (Biosffer Dyfi in Welsh). It has UNESCO status.[3] Within the biosphere are a number of Special Areas of Conservation and Sites of Special Scientific Interest (Cors Fochno, Coed Cwm Einion and Pen Llŷn a’r Sarnau).

Film Location[edit]

The Dyfi estuary was used as a location shot in Led Zeppelin's 1976 film The Song Remains the Same. The segment of the film is where Robert Plant comes ashore on a boat, after which he rides a horse, making his way to Raglan Castle. Plant was obviously behind the choice of the location,[citation needed] being familiar with the area; Bron-Yr-Aur cottage is located on the edge of Machynlleth.

See also[edit]


  1. ^ Erichsen Jones, J. R. (May 1941). "The Fauna of the River Dyfi, West Wales". Journal of Animal Ecology. British Ecological Society. 10 (1): 12. doi:10.2307/1339.
  2. ^ "Pont ar Ddyfi Bridge, Machynlleth". Gwynedd Archaeological Trust. Retrieved 28 August 2017.
  3. ^ The Dyfi Biosphere website

External links[edit]

Coordinates: 52°36′01″N 3°51′24″W / 52.6004°N 3.8567°W / 52.6004; -3.8567