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 includes more or less every watercourse named on Ordnance Survey mapping, and thus many of the main rivers of Wales (as defined by Natural Resources Wales ). Difficulties arise otherwise in determining what should and what should not be included.Ordnance Survey 1:25,000 (Explorer) and 1:50,000 (Landranger) scale maps of Wales

Certain names are encountered frequently, and particular care should be taken to differentiate between the various occurrences of Clydach, Clywedog and Dulas, for example, as well as names that appear to refer 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) Worthenbury Brook (R) Emral Brook (Ls) Wych Brook (Rs) (formerly known as the "River Elfe") Red Brook (L) River Clywedog (L) (Afon Clywedog) River Gwenfro (L) (Afon Gwenfro) Glanyrafon Brook (R) Black Brook (R) (Afon Ddu) Shell Brook (R) River Ceiriog (R) (Afon Ceiriog) (head of river is Ceiriog Ddu) River Teirw (L) (Afon Teirw) Nant Sarffle (R) Nant Cwm-y-geifr (R) Nant Cwm-llawenog (R) Nant Rhydwilym (R) River Eitha (L) (Afon Eitha) Eglwyseg River (L) Afon Morwynion (L) River Alwen (L) (Afon Alwen) Afon Ceirw (R) Merddwr (R) (known as Nant Lleidiog upstream) Afon Medrad (R) Afon Brenig (L) Afon Trystion (R) Afon Llynor (R) Afon Ceidiog (R) Hirnant (R) Afon Tryweryn (L) (River Tryweryn) Afon Mynach (Dee) (L) Afon Hesgyn (L) Afon Gelyn (L) (flows into Llyn Celyn) Nant Aberderfel (R) (flows into Llyn Celyn) Afon Llafar (L) (flows into Llyn Tegid) Afon Twrch (R) Afon Lliw (L)

Clwyd catchment

River Clwyd (Afon Clwyd) River Gele (L) (Afon Gele) River Elwy (L) (Afon Elwy; also known as Afon Cledwen above the village of Llangernyw) (R) River Aled (R) Afon Gallen (Ls) River Wheeler (R) (Afon Chwiler) (R) River Clywedog (L) (Afon Clywedog; not to be confused with the Dee tributary of the same name)

Conwy catchment

River Conwy (Afon Conwy) Afon Gyffin (L) Afon Roe (L) (known as Afon Tafolog in upper reaches) Afon Dulyn (L) Afon Ddu (L) Afon Garreg-wen (L) Ffrwd Cerriguniawn (L) Afon Melynllyn (R) Afon Porth-llwyd (L) Afon Eigiau Afon Ddu (L) Afon Crafnant (L) Afon Geirionydd (R) Afon Gallt y Gwg (R) Nant y Goron (R) Afon Llugwy (L) Nantygwryd (R) Afon Lledr (L) Afon Wybrnant (R) Afon Maesgwm (R) Afon Ystumiau (L) Afon Machno (L) Afon Glasgwm (L) Afon Iwrch (R) Afon Eidda (L) Merddwr (R) Afon Caletwr (R) Afon Serw (R)

Simple coastal catchments

Afon Gyrach Afon Ddu Afon Glan-sais (L) Afon Maes-y-bryn (R) Afon Llanfairfechan, Llanfairfechan Afon Dulas, Llanddulas Afon Colwyn, Old Colwyn

Aber catchment

Afon Aber Afon Anafon (Rs) Afon Rhaeadr Fawr (Ls) Afon Rhaeadr Bach (Ls) Afon Gam (L) Afon Goch (Rs)

Ogwen catchment

Afon Ogwen Afon Caseg (R) Afon Llafar (L) Afon Denau (flows into Llyn Ogwen) Nant Gwern y Gof (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) Nant Meigan Lleiniog Afon Nodwydd Afon y Marchogion Afon Lligwy Nant Perfedd Afon Goch (Dulas) Nant y Beddyw Afon Bryn Gwyn Afon Goch (Amlwch) Afon Wygyr Gwter Fudr Afon Alaw (River Alaw)

Crigyll catchment

Afon Crigyll Afon Caradog (L)

Ffraw catchment

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

Cefni catchment

Afon Cefni (River Cefni) Afon Newydd (L) Afon Ceint (L) Afon Erddreiniog (L) (flows into Cefni Reservoir)

Braint (i) catchment The Afon Braint bifurcates near Llanfairpwllgwyngyll to form two different watercourses. Afon Braint (River Braint, Dwyran) Afon Rhyd y Valley (L)

Braint (ii) catchment

Afon Braint (LlanfairPG) Afon Rhyd Eilian (L)

Note: "Afon Menai", known as the "Menai Strait" in English, is not a river, despite its Welsh name. (It is more usually known in Welsh as simply "Y Fenai".)

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 Afon Carrog (L) Afon Rhŷd (R)

Simple coastal catchments

Afon Llifon Afon Llyfni, Lleyn Afon Desach Afon Hen Nant Gwrtheyrn Afon Geirch Afon Amwlch Afon Pen-y-graig

Rivers flowing into Cardigan Bay From the tip of the Llŷn Peninsula to St. David's Head Afon Saint

Daron catchment Afon Daron Afon Cyllyfelin (R)

Soch catchment

Afon Soch Afon Horon (L)

Rhyd-hir catchment etc

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

Dwyfor catchment

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

Glaslyn catchment

Afon Glaslyn Afon Dylif Afon Croesor (L) Nantmor (L) Afon Colwyn (R) Afon Llynedno (L) Afon Dwyryd (Headwaters are disputed to be the Afon Goedol) Afon y Glyn (L) Afon Prysor (L) Afon Cynfal (L) Afon Teigl (L) Afon Bowydd Afon Tafarn Helyg

Artro catchment

Afon Artro Afon Cwmnantcol (L)

Ysgethin catchment

Afon Ysgethin

Mawddach catchment

Afon Mawddach Afon Dwynant (R) Afon Gwynant (L) Afon Cwm-llechen (R) Afon Cwm-mynach (R) Afon Wnion (L) Afon Clywedog (L) Afon Celynog (L) Afon Wen (L) Afon Gamlan (R) Afon Eden (R) Afon Crawcwellt (R) Afon Gain (R)

Dysynni catchment

Afon Dysynni (R) Nant Cynfal (L) Afon Fathew (L) Nant Rhyd-yr-onen (L) Afon Cwm-Pandy (L) Nant Dôl-Goch (L) Afon Cadair (R) Nant Gwernol (L)

Dyffryn Gwyn catchment

Afon Dyffryn Gwyn

Dyfi catchment

River Dyfi (River Dovey) Afon Ceirig Afon Leri (L) Afon Ceulan (R) Afon Einion (L) Afon Llyfnant (L) Afon Dulas (R) (North Dulas) Afon Deri (R) Nant Ceiswyn (R) Afon Dulas (L) (South Dulas) Afon Twymyn (L) Afon Rhiwsaeson (R) Afon Laen (L) Afon Angell (R) Afon Cleifion (L) Afon Dugoed (Rs) Afon Tafolog (Ls) Afon Cerist (R) Afon Cywarch (R)

Clarach catchment

Afon Clarach (formed at the confluence of Afon Stewi and Nant Silo) Bowstreet Brook (R) Afon Peithyll (Ls)

Rheidol catchment

River Rheidol (Afon Rheidol) Afon Melindwr (R) River Mynach (L) (Afon Mynach) Afon Merin (Rs) Nant Rhuddnant (Ls) Afon Castell (L) Afon Llechwedd Mawr (flows into Nant y Moch Reservoir) Afon Lluestgota (R) Afon Hengwm (flows into Nant y Moch Reservoir) Afon Hyddgen (R) Nant-y-moch (stream flowing into Nant-y-moch Reservoir)

Ystwyth catchment

River Ystwyth (Afon Ystwyth) Afon Fâd (L) Afon Llanfihangel (R) Nant Cynon (Ls) Afon Magwr (R) Nant Freuo (L) Nant Pant-yr-Haidd (R) Nant Cwmtarw (L) Nant Cwm-nel (L) Nant Cilmeddu (L) Nant y Henfelin (L) Nant yr Brithyll (R) Nant y Berws (L) Nant Cell (R) Nant Lledwenau (R) Nant Bwlchgwallter (L) Nant Peiran (R) Nant Crafanglach (R) Nant Perfedd (L) Nant Ffrin-fawr (Rs) Nant Hylles (L) Nant Gau (L) Nant Ffrwd-ddu (L) Nant Cae-glas (R) Nant y Gwndwn-gwyn (Ls) Nant Cwta (Rs) Nant Milwyn (L) Nant Byr (L) Nant y Gwaith (R) Nant Watcyn (R) Nant yr Onnen (R) Nant Cwm-du (L) Nant Stwc (R) Nant Penygwndwn (L) Nant Garw (R) Nant y Cae Isaf (L) Nant y Cae (L) Nant Troedyrhiw (R) Afon Diliw (R) Nant yr Gafod (R) Diliw Fechan (R) Nant y Caseg (L) Nant yr Eglwys Nant yr Eglwys-fach (L) Nant Lwyd (R) Nant y Gorlan (Rs) Nant Llychese (R) Nant Rhydyfelin (L) Nant Ffos-casaf (L)

Wyre catchment

Afon Wyre Afon Carrog (R) Wyre Fach (L) Nant Rhydrosser (L) Afon Tryal (L) Afon Beidog (L)

Cledan catchment

Afon Cledan

Arth catchment

River Arth

Aeron catchment

Afon Aeron Afon Mydr (L) Gwenffrwd (R)

Coastal streams

Afon Drywi Afon Soden Afon Fynnon Ddewi Nant Hawen Hoffnant

Teifi catchment

River Teifi (Afon Teifi) Afon Piliau (L) Nant Arberth (R) Afon Cych (L) Afon Dulas (L) Afon Pedran (L) Afon Sylgen (R) Afon Hirwaun (R) Nant Elfed (R) Afon Ceri (R) Afon Dulas (Lampeter) (R) Afon Bedw (L) Nant Bargod (L) Afon Tyweli (L) Afon Talog (R) Afon Clettwr (P) Clettwr Fawr (Rs) Clettwr Fach (Ls) Nant Cledlyn (R) Afon Duar (L) Afon Granell (R) Afon Dulas (Llandyssul) (R) Afon Denys (R) Nant Clywedog (L) Clywedog-isaf (Ls) Clywedog-ganol (Rs) Clywedog-uchaf (R) Afon Brefi (L) Nant Bryn-maen (R) Afon Berwyn (L) Afon Groes (R) Afon Fflur (L) Camddwr (R) Afon Meurig (R) Nant Lluest (R) Glasffrwd (L) Nant Egnant (L) Nant Rhydol (R)

Nevern catchment etc

River Nevern Nant Duad (R) Afon Brynberian (L) Afon Bannon (L)

Minor coastal catchments

River Gwaun (Afon Gwaun) River Aer (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) Brandy Brook

Cleddau catchment

Daugleddau (estuary is Daugleddyf or Milford Haven downstream) Pembroke River (L) Carew River (L) Cresswell River (L) Western Cleddau (Rs) Millin Brook (L) Merlin's Brook (R) Cartlett Brook (L) Knock Brook (R) Camrose Brook (R) Rudbaxton Water (L) Spittal Brook (L) Nant-y-coy Brook (R) Afon Anghof (L) Afon Glan-rhyd (R) Nant y Bugail (L) Afon Cleddau (upper reaches of Western Cleddau) Eastern Cleddau (Ls) Afon Syfynwy (R) Afon Wern (R)

Rivers flowing into the Bristol Channel From St. Govan's Head to M48 Bridge

South Pembrokeshire rivers The Ritec (Afon Rhydeg}

Taf catchment

River Tâf (Afon Taf) River Cywyn (Afon Cywyn) (L) Afon Cynin (L) Afon Dewi Fawr (L) Afon Sien (R) Afon Fenni (R) Afon Gronw (L) Afon Marlais (R)

Towy catchment

Afon Tywi (River Towy) Afon Gwili (R) Afon Annell (R) River Cothi (R) (Afon Cothi) Afon Gorlech (R) Afon Twrch (R) Afon Marlais (R) Afon Dulas (R) Afon Cennen (L) Afon Sawdde (L) Afon Bran (L) Afon Ydw (R) Afon Dulais (R) Afon Brân (L) Cynnant Fawr (Rs) Cynnant Fach (L) Afon Lwynor (Ls) Afon Crychan (L) Afon Gwydderig (L) Afon Gwenlais (R) Gwenffrwd (R) Nant Melyn (R) Afon Doethie (R) Afon Pysgotwr Fawr (R) Afon Pysgotwr Fach (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) Burry Pill (L) Afon Lliw (L) Afon Llan (L) Afon Gwili (R) River Amman (L) Afon Lash (R) Afon Morlais (R) Afon Dulais Afon Camffrwd

Clyne catchment Clyne River

Tawe catchment

River Tawe Nant-y-fendrod (L) Lower Clydach River (R) Upper Clydach River (R) River Egel (L) Afon Twrch (R) Nant Gwys (L) Gwys Fawr (Ls) Gwys Fach (Rs) Nant Llynfell (R) Nant y Llyn (R) River Giedd (R) Nant Cyw (L) Nant Ceiliog (L) Nant Llech (L) Nant Llech Pellaf (L) River Haffes (R) Nant Byfre (L) Nant y Llyn (R)