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 river of a catchment is given, left-bank tributaries are indicated by, and right-bank tributaries by. Note that, in general usage, the 'left bank of a river' refers to the left 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 and 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. 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, Afon Ddu and Afon Wen.

Mainland rivers flowing into Liverpool Bay

''From Dee Estuary to Garth Pier, Bangor, Gwynedd''

Dee catchment

Clwyd catchment

Conwy catchment

Simple coastal catchments

Aber catchment

Ogwen catchment

Cegin catchment

Adda catchment

Isle of [Anglesey] rivers

Anticlockwise from Menai Bridge / Porthaethwy

Minor coastal catchments

  • Afon Cadnant
  • Nant Meigan
  • Lleiniog
  • Afon Nodwydd
  • Afon y Marchogion
  • Afon Lligwy
  • Nant Perfedd
  • Afon Goch
  • Nant y Beddyw
  • Afon Bryn Gwyn
  • Afon Goch
  • Afon Wygyr
  • Gwter Fudr
  • Afon Alaw

Crigyll catchment

  • Afon Crigyll
  • * Afon Caradog

Ffraw catchment

Cefni catchment

  • Afon Cefni
  • * Afon Newydd
  • * Afon Ceint
  • * Afon Erddreiniog

Braint (i) catchment

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

Braint (ii) catchment

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

Rivers flowing into [Cardigan Bay]

From the tip of the Llŷn Peninsula to St. David's Head
  • Afon Saint

Daron catchment

Soch catchment

Rhyd-hir catchment etc

Dwyfor catchment

Glaslyn catchment

Artro catchment

Ysgethin catchment

Mawddach catchment

Dysynni catchment

  • Afon Dysynni
  • * Nant Cynfal
  • * Afon Fathew
  • ** Nant Rhyd-yr-onen
  • ** Afon Cwm-Pandy
  • ** Nant Dôl-Goch
  • * Afon Cadair
  • * Nant Gwernol

Dyffryn Gwyn catchment

Dyfi catchment

Clarach catchment

Rheidol catchment

Ystwyth catchment

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

Wyre catchment

  • Afon Wyre
  • * Afon Carrog
  • * Wyre Fach
  • ** Nant Rhydrosser
  • ** Afon Tryal
  • * Afon Beidog

Cledan catchment

  • Afon Cledan

Arth catchment

Aeron catchment

Coastal streams

  • Afon Drywi
  • Afon Soden
  • Afon Fynnon Ddewi
  • Nant Hawen
  • Hoffnant

Teifi catchment

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

Nevern catchment etc

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''

South Pembrokeshire rivers

  • The Ritec (Afon Rhydeg

Taf catchment

Towy catchment

Gwendraeth catchment

Lliedi catchment

Loughor catchment

Clyne catchment

Tawe catchment

Neath catchment

Afan catchment

  • River Afan
  • * Ffrwd Wyllt
  • * Nant Cwm Wenderi
  • * Afon Pelenna
  • * Nant Cregan
  • * Afon Corrwg
  • ** Afon Corrwg Fechan

Kenfig catchment

Ogmore catchment

Col-huw catchment

  • Afon Col-huw
  • * Ogney Brook
  • * Hoddnant
  • ** Boverton Brook
  • ** Llanmaes Brook

Thaw catchment

  • River Thaw
  • * Kenson River
  • ** River Waycock
  • ** Nant Llancarfan
  • * Nant y Stepsau

Cadoxton catchment

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.

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.