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List of rivers of Wales facts for kids

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This is a list of rivers of Wales, organised geographically, taken anti-clockwise, from the Dee Estuary through 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), 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.

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)
    • 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 Bala Lake)
    • Afon Twrch (R)
    • Afon Lliw (L)

Clwyd catchment

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

Conwy catchment

Simple coastal catchments

  • Afon Gyrach
  • Afon Ddu
    • Afon Glan-sais (L)
    • Afon Maes-y-bryn (R)

Aber catchment

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

Ogwen catchment

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

  • 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 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

Gwyrfai catchment

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

Rhyd-hir catchment etc

Dwyfor catchment

Glaslyn catchment

Artro catchment

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

Dyfi catchment

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

Aeron catchment

Coastal streams

  • Afon Drywi
  • Afon Soden
  • Afon Fynnon Ddewi
  • Hoffnant

Teifi catchment

  • River Teifi (Afon Teifi)
    • Afon Piliau (L)
    • Nant Arberth (R)
    • Afon Cych (L)
    • Afon Hirwaun (R)
    • Nant Elfed (R)
    • Afon Ceri (R)
    • 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 (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)

Nyfer catchment etc

  • Afon Nyfer
    • Nant Duad (R)
    • Afon Brynberian (L)
    • Afon Bannon (L)

Minor coastal catchments

Rivers flowing to west Pembrokeshire coast

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

Minor catchments

Cleddau catchment

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)
    • Afon Cynin (L)
      • Afon Dewi Fawr (L)
      • Afon Sien (R)
    • Afon Fenni (R)
    • Afon Gronw (L)
    • Afon Marlais (R)

Towy catchment

Gwendraeth catchment

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

Tawe catchment

Neath catchment

Afan catchment

  • River Afan
    • Ffrwd Wyllt (L)
    • Nant Cwm Wenderi
    • Afon Pelenna (R)
    • Nant Cregan
    • Afon Corrwg (R)
      • Afon Corrwg Fechan (R)

Kenfig catchment

Ogmore catchment

Col-huw catchment

  • Afon Col-huw
    • Ogney Brook (Rs)
    • Hoddnant (Ls)
      • Boverton Brook (Ls)
      • Llanmaes Brook (Rs)

Thaw catchment

  • River Thaw
    • Kenson River (L)
      • River Waycock (Ls)
      • Nant Llancarfan (Rs)
    • Nant y Stepsau (R)

Cadoxton catchment

  • Cadoxton River
    • Bullcroft Brook (Ls)
    • Wrinstone Brook (Rs - Only at confluence of Wrinstone Brook and Bullcroft Brook does the river become the Cadoxton)
    • East Brook (L)
    • Cold Brook, Cadoxton (R)
      • Nant yr Argae (Ls)
    • Sully Brook (L)

Taff catchment

Rhymney catchment

Usk catchment

Wye catchment

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)
        • Cynllaith (L) (part forms the border between Wales and England)
          • Afon Ogau
        • Afon Iwrch (L)
        • Afon Rhaeadr (L)
        • Afon Eirth (L)
      • Afon Cain (L)
        • Nant Fyllon (Ls)
        • Nant Alan (Rs)
      • Afon Banwy (R) (a.k.a. Afon Einion)
    • Maerdy Brook (L)
    • New Cut/Guilsfield Brook (L)
    • Luggy Brook (L)
    • Camlad (R) (partly in England)
    • River Rhiw (Afon Rhiw) (L)
      • Afon Rhiw (north fork) (Rs)
      • Afon Rhiw (south fork)(Ls)
    • Llifior Brook (L)
    • The Mule (R) (Afon Miwl)
    • Bechan Brook (L)
    • Mochdre Brook (R)
    • Nant Rhyd-ros lan??
    • Afon Carno (L)
      • Afon Cerniog (R)
      • Afon Cledan (R)
    • Afon Trannon (L)
    • Nant Feinion (R)
    • Wigdwr Brook (L)
    • Afon Clywedog (L)
      • Afon Biga (R) (flows into Clywedog Reservoir)
      • Afon Llwyd (R) (flows into Clywedog Reservoir)
    • Afon Dulas (R)
      • Afon Brochan (L)
      • Nant Cydros (R)
      • Rhydyclwydau Brook (R)

Longest rivers in Wales

This is a table of the longest rivers wholly or partially in Wales. 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
(miles) (km)
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 Dee 70 113
5 River Towy 75 121 Longest river entirely within Wales
6 River Teifi 73 117
7 River Usk 56 90
8 River Taff 40 64
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