List of rivers of Wales

This is a list of rivers of Wales, organised geographically. It is taken anti-clockwise from the Dee Estuary to the M48 Bridge that separates the estuary of the River Wye from the River Severn.

Tributaries are listed down the page in an upstream direction, starting with those closest to the sea. The main stem (or principal) river of a catchment is given, left-bank tributaries are indicated by (L), and right-bank tributaries by (R). Note that, in general usage, the 'left (or right) bank of a river' refers to the left (or right) hand bank as seen when looking downstream. Where a named river is formed by the confluence of two differently named rivers, these are labelled as (Ls) and (Rs) for the left and right forks. A prime example is the formation of the River Taff from the Taf Fawr and the Taf Fechan at Cefn Coed-y-cymmer.

The list is essentially a list of the main rivers of Wales (as defined by the Environment Agency) and which more or less includes every watercourse named on Ordnance Survey mapping. Difficulties arise otherwise in determining what should and what should not be included.^[1]

Certain names are encountered frequently and particular care should be taken to differentiate between the various occurrences of Clydach, Clywedog and of Dulas for example as well as those whose names refer perhaps to the colour of their waters e.g. Afon Goch (red river), Afon Ddu (black/dark river) and Afon Wen (white/light river).

Mainland rivers flowing into Liverpool Bay[]

From Dee Estuary to Garth Pier, Bangor, Gwynedd

Dee catchment[]

River Dee, Wales (Afon Dyfrdwy)
- Nant-y-fflint (L) (flows into Dee Estuary)
- Wepre Brook (L) (flows into Dee Estuary)
- Aldford Brook (R) (wholly in England)
- River Alyn (L) (Afon Alun / River Alun)
  - River Cegidog (R) (Afon Cegidog)
    - Nant-y-Ffrith (R)
  - River Terrig (R) (Afon Terrig)
- (R)
  - (Ls)
  - Wych Brook (Rs) (formerly known as the "River Elfe")
    - (L)
- River Clywedog (L) (Afon Clywedog)
  - River Gwenfro (L) (Afon Gwenfro)
  - (R)
    - (R) (Afon Ddu)
- (R)
- River Ceiriog (R) (Afon Ceiriog) (head of river is Ceiriog Ddu)
  - (L) (Afon Teirw)
  - (R)
  - (R)
  - (R)
  - (R)
- River Eitha (L) (Afon Eitha)
- (L)
- (L)
- (L) (Afon Alwen)
  - (R)
  - (R) (known as Nant Lleidiog upstream)
    - (R)
  - (L)
- (R)
- (R)
- (R)
- (R)
- Afon Tryweryn (L) (River Tryweryn)
  - (L)
  - (L)
  - (L) (flows into Llyn Celyn)
  - (R) (flows into Llyn Celyn)
- (L) (flows into Bala Lake)
- (R)
- (L)

Clwyd catchment[]

River Clwyd (Afon Clwyd)
- (L)
- River Elwy (L) (Afon Elwy)(Also known as Afon Cledwen above the village of Llangernyw)
  - (R)
  - River Aled (R)
  - (Ls)
- River Wheeler (R) (Afon Chwiler)
- (R)
- (L) (Afon Clywedog) (Not to be confused with the Dee tributary of the same name)

Conwy catchment[]

River Conwy (Afon Conwy)
- (L)
- Afon Roe (L) (known as Afon Tafolog in upper reaches)
- Afon Dulyn (L)
  - Afon Ddu (L)
  - (L)
  - (L)
  - Afon Melynllyn (R)
- Afon Porth-llwyd (L)
  - Afon Eigiau
- Afon Ddu (L)
- Afon Crafnant (L)
  - Afon Geirionydd (R)
- (R)
- (R)
- Afon Llugwy (L)
  - Nantygwryd (R)
- Afon Lledr (L)
  - (R)
  - (R)
  - (L)
- Afon Machno (L)
  - (L)
- (R)
- (L)
- (R)
- (R)
- (R)

Simple coastal catchments[]

Afon Ddu
- (L)
- (R)

Aber catchment[]

Afon Aber
- Afon Anafon (Rs)
- (Ls)
  - (Ls)
    - (L)
  - (Rs)

Ogwen catchment[]

Afon Ogwen
- Afon Caseg (R)
  - Afon Llafar (L)
  - (flows into Llyn Ogwen)
    - (L)
  - Afon Lloer (flows into Llyn Ogwen)

Cegin catchment[]

River Cegin (Afon Cegin)

Adda catchment[]

River Adda (Afon Adda)

Isle of Anglesey rivers[]

Anticlockwise from Menai Bridge / Porthaethwy

Minor coastal catchments[]

Afon Cadnant (River Cadnant)
(Dulas)
(Amlwch)
Afon Alaw (River Alaw)

Crigyll catchment[]

- (L)

Ffraw catchment[]

Afon Ffraw
- Afon Frechwen (L)
- Afon Gwna (flows into Llyn Coron)

Cefni catchment[]

Afon Cefni (River Cefni)
- (L)
- (L)
- (L) (flows into Cefni Reservoir)

Braint (i) catchment[]

The Afon Braint bifurcates near Llanfairpwllgwyngyll to form two different watercourses.

Afon Braint (River Braint, Dwyran)
- (L)

Braint (ii) catchment[]

Afon Braint (LlanfairPG)
- (L)

Note "Afon Menai", known as the "Menai Strait" in English, is not technically a river, despite its Welsh name..

Mainland rivers flowing into the Menai Strait and Caernarfon Bay[]

From Bangor Pier to the tip of the Llŷn Peninsula

Seiont catchment[]

Afon Seiont (River Seiont) (known as Afon Rhythallt above Pont-Rhythallt)
- Afon Nant Peris (flows into Llyn Peris)
  - Afon Arddu (L)

Gwyrfai catchment[]

Afon Gwyrfai
- (L)
  - (R)

Simple coastal catchments[]

Afon Llyfni, Lleyn
Nant Gwrtheyrn

Rivers flowing into Cardigan Bay[]

From the tip of the Llŷn Peninsula to

Daron catchment[]

Afon Daron
- (R)

Soch catchment[]

Afon Soch
- (L)

Rhyd-hir catchment etc[]

Afon Rhyd-hir
- (R)
Afon Erch
Afon Wen

Dwyfor catchment[]

Afon Dwyfor
- Afon Dwyfach (R)
- Afon Henwy (L)

Glaslyn catchment[]

Afon Glaslyn
- - (L)
- Nantmor (L)
- Afon Colwyn (R)
- (L)
Afon Dwyryd (Headwaters are disputed to be the Afon Goedol)
- Afon y Glyn (L)
- Afon Prysor (L)
- Afon Cynfal (L)
- (L)
- Afon Bowydd

Artro catchment[]

Afon Artro
- Afon Cwmnantcol (L)

Ysgethin catchment[]

Afon Ysgethin

Mawddach catchment[]

Afon Mawddach
- (R)
- (L)
- (R)
- (R)
- Afon Wnion (L)
  - (L)
  - (L)
- Afon Wen (L)
- (R)
- Afon Eden (R)
  - (R)
- (R)

Dysynni catchment[]

Afon Dysynni (R)
- Afon Fathew (L)
- (R)
- (L)

Dyfi catchment[]

River Dyfi (River Dovey)
- Afon Leri (L)
  - (R)
- (L)
- Afon Llyfnant (L)
- Afon Dulas (R) (North Dulas)
  - Afon Deri (R)
  - Nant Ceiswyn (R)
- Afon Dulas (L) (South Dulas)
- Afon Twymyn (L)
  - (R)
    - (L)
- Afon Angell (R)
- (L)
  - (Rs)
  - Afon Tafolog (Ls)
- Afon Cerist (R)
- (R)

Clarach catchment[]

Afon Clarach (formed at the confluence of and )
- (R)
- (Ls)

Rheidol catchment[]

River Rheidol (Afon Rheidol)
- (R)
- River Mynach (L) (Afon Mynach)
  - (Rs)
  - (Ls)
- (L)
- (flows into )
  - (R)
- (flows into Nant y Moch Reservoir)
  - (R)
- Nant-y-moch (stream flowing into Nant-y-moch Reservoir)

Ystwyth catchment[]

River Ystwyth (Afon Ystwyth)
- (L)
- (R)
  - (Ls)
- (R)
- (L)
- (R)
- (L)
  - (L)
- (L)
- (L)
  - (R)
- (L)
- (R)
- (R)
- (L)
- (R)
  - (R)
  - (L)
  - (Rs)
    - (L)
- (L)
  - (L)
- (R)
  - (Ls)
  - (Rs)
- (L)
- (L)
- (R)
- (R)
- (R)
- (L)
- (R)
- (L)
- (R)
- (L)
- (L)
- (R)
- (R)
  - (R)
  - (R)
  - (L)
  - - (L)
  - (R)
  - (Rs)
  - (R)
- (L)
- (L)

Wyre catchment[]

Afon Wyre
- (R)
- (L)
  - (L)
  - (L)
- (L)

Cledan catchment[]

Arth catchment[]

River Arth

Aeron catchment[]

Afon Aeron
- (L)
- (R)

Coastal streams[]

Teifi catchment[]

River Teifi (Afon Teifi)
- (L)
- (R)
- Afon Cych (L)
  - Afon Dulas (L)
  - (L)
  - (R)
- (R)
- (R)
- (R)
  - (R)
  - (L)
- (L)
- (L)
  - (R)
- (P)
  - (Rs)
  - (Ls)
- (R)
- (L)
- (R)
- (R)
  - (R)
- (L)
  - (Ls)
  - (Rs)
    - (R)
- (L)
- (R)
- (L)
  - (R)
- (L)
- Camddwr (R)
- (R)
- (R)
- (L)
- (L)
- (R)

Nyfer catchment etc[]

Afon Nyfer
- (R)
- (L)
- (L)

Minor coastal catchments[]

River Gwaun (Afon Gwaun)
- (L)

Rivers flowing to west Pembrokeshire coast[]

From St David's Head to St. Govan's Head

Minor catchments[]

River Alun
River Solva (Afon Solfach)

Cleddau catchment[]

Daugleddau (estuary is or Milford Haven downstream)
- Pembroke River (L)
- (L)
- (L)
- Western Cleddau (Rs)
  - (L)
  - (R)
  - (L)
  - (R)
    - (R)
  - (L)
  - (L)
  - (R)
  - (L)
    - (R)
  - (L)
  - Afon Cleddau (upper reaches of Western Cleddau)
- Eastern Cleddau (Ls)
  - Afon Syfynwy (R)
  - (R)

Rivers flowing into the Bristol Channel[]

From St. Govan's Head to M48 Bridge

Taf catchment[]

River Tâf (Afon Taf)
- River Cywyn (Afon Cywyn) (L)
- (L)
  - (L)
  - (R)
- (R)
- (L)
- Afon Marlais (R)

Towy catchment[]

Afon Tywi (River Towy)
- Afon Gwili (R)
- Afon Annell (R)
- River Cothi (R) (Afon Cothi)
  - (R)
  - Afon Twrch (R)
  - Afon Marlais (R)
- Afon Dulas (R)
- Afon Cennen (L)
- Afon Sawdde (L)
- Afon Bran (L)
  - (R)
- Afon Dulais (R)
- Afon Brân (L)
  - Cynnant Fawr (Rs)
    - Cynnant Fach (L)
  - Afon Lwynor (Ls)
  - (L)
  - Afon Gwydderig (L)
- (R)
- Gwenffrwd (R)
  - (R)
- (R)
  - (R)
    - (R)
- Camddwr (R)

Gwendraeth catchment[]

River Gwendraeth
- Gwendraeth Fach (Rs)
- Gwendraeth Fawr (Ls)

Lliedi catchment[]

River Lliedi (Afon Lliedi)

Loughor catchment[]

River Loughor (Afon Llwchwr)
- (L)
- (L)
  - (L)
- Afon Gwili (R)
- River Amman (L)
- (R)
- Afon Morlais (R)
- Afon Dulais

Clyne catchment[]

Clyne River

Tawe catchment[]

River Tawe
- (L)
- Lower Clydach River (R)
- Upper Clydach River (R)
  - (L)
- Afon Twrch (R)
  - Nant Gwys (L)
    - Gwys Fawr (Ls)
    - Gwys Fach (Rs)
  - (R)
  - (R)
- River Giedd (R)
  - (L)
  - (L)
- Nant Llech (L)
  - (L)
- River Haffes (R)
- (L)
- (R)

Neath catchment[]

River Neath
- River Clydach (R)
- River Dulais (R)
- (L)
- (L)
- Nedd Fechan (Rs)
  - Afon Pyrddin (R)
- Afon Mellte (Ls)
  - Sychryd(L)
  - Afon Hepste (L)
  - Afon Llia (Rs)
  - Afon Dringarth (Ls)

Afan catchment[]

River Afan
- Ffrwd Wyllt (L)
- (R)
- (R)
  - (R)

Kenfig catchment[]

River Kenfig (Afon Cynffig)

Ogmore catchment[]

River Ogmore (Afon Ogwr)
- River Ewenny (L)
  - Afon Alun (L)
  - (L)
  - (L)
  - (R)
- River Llynfi (R)
  - (R)
  - (L)
- Afon Garw (R)
- (Rs)
- (Ls)
  - (R)

Col-huw catchment[]

Afon Col-huw
- (Rs)
- (Ls)
  - (Ls)
  - (Rs)

Thaw catchment[]

River Thaw
- (L)
  - (Ls)
  - (Rs)
- (R)

Cadoxton catchment[]

Cadoxton River
- (L)
- (R)
  - (L)
- (L)
- (Ls)
- (Rs)

Taff catchment[]

River Taff (Afon Taf)
- River Ely (Afon Elái) (R)
  - Afon Clun (L) (Nant Myddlyn in upper reaches)
- River Rhondda (R) (Afon Rhondda)
  - Rhondda Fawr (Ls)
  - Rhondda Fach (Rs)
  - (Afon Ritec)
- Nant Clydach (R)
- River Cynon (R) (Afon Cynon)
- (L)
- Nant Morlais
- Taf Fechan (Ls)
- Nant Ffrwd (Rs)

Rhymney catchment[]

Rhymney River (Afon Rhymni)
- (R)

Usk catchment[]

River Usk (Afon Wysg)
- Ebbw River (R) (Afon Ebwy)
  - Sirhowy River (R)
  - River Ebbw Fach (L)
- Afon Llwyd (R)
- Sôr Brook (R)
- Olway Brook (L)
- Berthin Brook (R)
- Afon Gafenni (L) (River Gavenny)
  - Afon Cibi (R)
- River Clydach (R)
- Grwyne Fawr (L)
  - Grwyne Fechan (R)
- Rhiangoll (L)
- (R)
- Afon Crawnon (R)
- Caerfanell (R)
- Nant Menasgin (R)
- Afon Cynrig (R)
- River Honddu (L)
- Afon Tarell (R)
- Afon Ysgir (L)
- Nant Brân (L)
- Afon Cilieni (L)
- Afon Senni (R)
- Afon Crai (R)
- Afon Hydfer (R)

Wye catchment[]

River Wye (Afon Gwy)
- River Trothy (R)
- River Monnow (Afon Mynwy) (R)
  - River Dore (L)
    - (R)
    - (L)
  - River Honddu (R)
  - (R)
  - (L)
- River Lugg (L) (Afon Llugwy)
  - River Frome (L)
  - River Kenwater
  - River Arrow (R)
- (R)
- Afon Llynfi (R)
  - River Ennig (R)
  - Dulas (L)
    - (L)
- Bachawy (L)
- (L)
- Duhonw (R)
- Afon Irfon (R)
  - (L)
  - Dulas (L)
  - (L)
  - Afon Dulas (R)
  - (L)
- (L)
- River Ithon (L) (Afon Ieithon)
  - Dulas (R)
  - (R)
  - (L)
  - Camddwr (L)
- Afon Elan (R)
  - (R)
    - (R)
    - (R)
    - (R)
  - (R)
- Afon Marteg (L)
- (L)
- (R)

Severn catchment[]

With the exception of a small part of the Rea Brook, all tributaries of the Severn downstream of the confluence of the Severn and the Vyrnwy are wholly in England. For details see List of rivers of England.

River Severn (Afon Hafren), Bristol Channel (Mor Hafren)
- Rea Brook (R) (small parts of upper catchment in Wales)
- River Vyrnwy (L) (Afon Efyrnwy) (lowermost section in England)
  - Afon Tanat (L) (lowermost section in England)
    - (L) (part forms the border between Wales and England)
    - Afon Iwrch (L)
    - Afon Rhaeadr (L)
    - (L)
  - Afon Cain (L)
    - (Ls)
    - (Rs)
  - Afon Banwy (R) (a.k.a. Afon Einion)
    - (R)
    - (R)
    - Afon Twrch (L)
- (L)
- (L)
- (L)
- Camlad (R) (partly in England)
- River Rhiw (Afon Rhiw) (L)
  - (north fork) (Rs)
  - (south fork)(Ls)
- (L)
- The Mule (R) (Afon Miwl)
- (L)
- (R)
- ??
- Afon Carno (L)
  - (R)
  - (R)
- (L)
  - Afon Cerist (R)
    - (L)
- (R)
- (L)
- Afon Clywedog (L)
  - (R) (flows into Clywedog Reservoir)
  - (R) (flows into Clywedog Reservoir)
- Afon Dulas (R)
  - (L)
  - (R)
  - (R)

Longest rivers in Wales[]

This is a table of the longest rivers wholly or partially in Wales.^[2] Rivers only partly in Wales are included in this table in italics. Note that river lengths given by different authorities vary due to the different ways in which the measurement is made or indeed estimated. That rivers are partly fractal in nature accounts for some variation and lengths can also vary slightly over time as meanders expand or are cut off where rivers run through broad flood-plains.

	River	Length		Notes
	River	(miles)	(km)	Notes
1	River Severn	220	354	Leaves Wales after 48 miles.
2	River Wye	135	217	Forms the Wales-England border for much of its length.
3	River Teme	81	130	Entirely in England after 12 miles.
4	River Usk	78	126^[3]	Longest river entirely in Wales according to some sources.
5	River Tywi	75	121	Longest river entirely within Wales according to some sources^[4]
6	River Teifi	73	117	^[4]
7	River Dee	70	113
8	River Taff	40	64

References[]

^ Ordnance Survey 1:25,000 (Explorer) and 1:50,000 (Landranger) scale maps of Wales
^ Encyclopædia Britannica. 1911. "Wales"
^ "Usk Management Catchment Summary" (PDF). Natural Resources Wales. Retrieved 14 November 2020.
^ Jump up to: ^a ^b The Welsh Academy Encyclopaedia of Wales. University of Wales Press. 2008.

[1] Ordnance Survey 1:25,000 (Explorer) and 1:50,000 (Landranger) scale maps of Wales

[2] Encyclopædia Britannica. 1911. "Wales"

[3] "Usk Management Catchment Summary" (PDF). Natural Resources Wales. Retrieved 14 November 2020.

[WAE-4] Jump up to: ^a ^b The Welsh Academy Encyclopaedia of Wales. University of Wales Press. 2008.

[1]

[2]

[3]

[4]

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List of rivers of Wales

Mainland rivers flowing into Liverpool Bay[]

Dee catchment[]

Clwyd catchment[]

Conwy catchment[]

Simple coastal catchments[]

Aber catchment[]

Ogwen catchment[]

Cegin catchment[]

Adda catchment[]

Isle of Anglesey rivers[]

Minor coastal catchments[]

Crigyll catchment[]

Ffraw catchment[]

Cefni catchment[]

Braint (i) catchment[]

Braint (ii) catchment[]

Mainland rivers flowing into the Menai Strait and Caernarfon Bay[]

Seiont catchment[]

Gwyrfai catchment[]

Simple coastal catchments[]

Rivers flowing into Cardigan Bay[]

Daron catchment[]

Soch catchment[]

Rhyd-hir catchment etc[]

Dwyfor catchment[]

Glaslyn catchment[]

Artro catchment[]

Ysgethin catchment[]

Mawddach catchment[]

Dysynni catchment[]

Dyfi catchment[]

Clarach catchment[]

Rheidol catchment[]

Ystwyth catchment[]

Wyre catchment[]

Cledan catchment[]

Arth catchment[]

Aeron catchment[]

Coastal streams[]

Teifi catchment[]

Nyfer catchment etc[]

Minor coastal catchments[]

Rivers flowing to west Pembrokeshire coast[]

Minor catchments[]

Cleddau catchment[]

Rivers flowing into the Bristol Channel[]

Taf catchment[]

Towy catchment[]

Gwendraeth catchment[]

Lliedi catchment[]

Loughor catchment[]

Clyne catchment[]

Tawe catchment[]

Neath catchment[]

Afan catchment[]

Kenfig catchment[]

Ogmore catchment[]

Col-huw catchment[]

Thaw catchment[]

Cadoxton catchment[]

Taff catchment[]

Rhymney catchment[]

Usk catchment[]

Wye catchment[]

Severn catchment[]

Longest rivers in Wales[]

See also[]

References[]