This is a list of rivers of Wales, organised

geographical Geography (from Greek: , ''geographia''. Combination of Greek words ‘Geo’ (The Earth) and ‘Graphien’ (to describe), literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, and ...

ly. It is taken anti-clockwise from the

Dee Estuary The Dee Estuary ( cy, Aber Dyfrdwy) is a large estuary by means of which the River Dee flows into Liverpool Bay. The estuary starts near Shotton after a five-mile (8 km) 'canalised' section and the river soon swells to be several miles ...

to the M48 Bridge that separates the estuary of the River Wye from the

River Severn , name_etymology = , image = SevernFromCastleCB.JPG , image_size = 288 , image_caption = The river seen from Shrewsbury Castle , map = RiverSevernMap.jpg , map_size = 288 , map_c ...

Tributaries A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainag ...

are listed down the page in an upstream direction, starting with those closest to the sea. The

main stem In hydrology, a mainstem (or trunk) is "the primary downstream segment of a river, as contrasted to its tributaries". Water enters the mainstem from the river's drainage basin, the land area through which the mainstem and its tributaries flow.. A ...

(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 The River Taff ( cy, Afon Taf) is a river in Wales. It rises as two rivers in the Brecon Beacons; the Taf Fechan (''little Taff'') and the Taf Fawr (''great Taff'') before becoming one just north of Merthyr Tydfil. Its confluence with th ...

from the Taf Fawr and the Taf Fechan at

Cefn Coed-y-cymmer Cefn-coed-y-cymmer () is a small community on the northwestern edge of Merthyr Tydfil County Borough in Wales. It is situated in the neck of land between the rivers Taf Fawr and Taf Fechan at their confluence (Welsh: 'cymer'). The village lies ...

. The list includes more or less every watercourse named on

Ordnance Survey Ordnance Survey (OS) is the national mapping agency for Great Britain. The agency's name indicates its original military purpose (see ordnance and surveying), which was to map Scotland in the wake of the Jacobite rising of 1745. There was a ...

mapping and thus many of the

main river Main rivers () are a statutory type of watercourse in England and Wales, usually larger streams and rivers, but also some smaller watercourses. A main river is designated by being marked as such on a main river map, and can include any structure o ...

s of

Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...

(as defined by

Natural Resources Wales Natural Resources Wales ( cy, Cyfoeth Naturiol Cymru) is a Welsh Government sponsored body, which became operational from 1 April 2013, when it took over the management of the natural resources of Wales. It was formed from a merger of the Coun ...

). 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

to Garth Pier, Bangor, Gwynedd''

Dee catchment

River Dee, Wales The River Dee ( cy, Afon Dyfrdwy, la, Deva Fluvius) is a river in the United Kingdom. It flows through parts of both Wales and England, forming part of the border between the two countries. The river rises in Snowdonia, Wales, flows east via ...

(Afon Dyfrdwy) ** Nant-y-fflint (L) (flows into

) ** Wepre Brook (L) (flows into Dee Estuary) **

Aldford Brook Aldford is a village and former civil parish, now in the parish of Aldford and Saighton, in the county of Cheshire, England. (). The village is approximately to the south of Chester, on the east bank of the River Dee. The Aldford Brook joins ...

(R) (wholly in England) **

River Alyn The River Alyn ( cy, Afon Alun) is a tributary of the River Dee, in north-east Wales. The River Alyn rises at the southern end of the Clwydian hills and the Alyn Valley forms part of the Clwydian Range and Dee Valley Area of Outstanding N ...

(L) (Afon Alun / River Alun) *** River Cegidog (R) (Afon Cegidog) ****

Nant-y-Ffrith Nant-y-Ffrith refers to a stream and the wooded valley through which it flows on the border between Flintshire and Wrexham County Borough in Wales. The stream begins in moorland to the east of Llandegla. It passes Bwlchgwyn village before ente ...

(R) ***

River Terrig The River Terrig ( cy, Afon Terrig) is a small river in north-east Wales. The river rises at Llyn Cyfynwy near Graianrhyd village in the community of Llanarmon-yn-Ial, Denbighshire, about three miles from the source of the River Alyn.'' Cam ...

(R) (Afon Terrig) ** Worthenbury Brook (R) *** Emral Brook (Ls) ***

Wych Brook The Wych Brook, Worthenbury Brook and Red Brook, formerly known as the River Elfe, is a tributary of the River Dee in England and Wales, forming part of both the historic and present-day border between the two countries. The stream forms part ...

(Rs) (formerly known as the "River Elfe") **** Red Brook (L) **

River Clywedog The River Clywedog is a river in Wrexham County Borough, Wales. Its uses have been watering crops, powering industrial machinery but is now used as walking trails or geography trips. The river originates to the west of Wrexham, and joins the ...

(L) (Afon Clywedog) ***

River Gwenfro The River Gwenfro ( cy, Afon Gwenfro) is a small river in Wrexham County Borough, north Wales. It is a tributary of the Clywedog.''Rand McNally encyclopedia of world rivers'', 1980, p.167 The name Gwenfro is possibly derived from the Welsh lang ...

(L) (Afon Gwenfro) ***

Glanyrafon Brook Aberystwyth () is a university and seaside town as well as a community in Ceredigion, Wales. Located in the historic county of Cardiganshire, means "the mouth of the Ystwyth". Aberystwyth University has been a major educational location in ...

(R) **** Black Brook (R) (Afon Ddu) **

Shell Brook Shell River, formerly Shell Brook, is a river in the north-central region of the Canadian province of Saskatchewan. The river begins at Big Shell Lake and travels in an easterly direction and flows into the Sturgeon River north of the city o ...

(R) **

River Ceiriog The River Ceiriog ( cy, Afon Ceiriog) is an long river in north east Wales, whose name may derive from a term meaning "favoured one". It is a tributary of the River Dee. It rises at an altitude of around on the south east slopes of Moel Ffern ...

(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 The River Eitha ( cy, Afon Eitha) is a small river in Wrexham County Borough, Wales. It is part of the River Dee catchment. Its name was probably derived from the Welsh word ''eithaf'' - "extremity", "farthest". Sir Cyril Fox, in his surveys o ...

(L) (Afon Eitha) **

Eglwyseg River The Eglwyseg valley is an area to the north east of Llangollen in Denbighshire, Wales; it is within the boundaries of Llantysilio Community. The name also refers to a widely scattered hamlet in the valley. Formerly the old township of Eglwysegl ...

(L) **

Afon Morwynion 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 upstrea ...

(L) **

River Alwen A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wat ...

(L) (Afon Alwen) ***

Afon Ceirw 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 upstre ...

(R) *** Merddwr (R) (known as Nant Lleidiog upstream) ****

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

(R) ***

Afon Brenig 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 upstrea ...

(L) ** Afon Trystion (R) ** Afon Llynor (R) ** Afon Ceidiog (R) ** Hirnant (R) **

Afon Tryweryn The Tryweryn is a river in the north of Wales which starts at Llyn Tryweryn in the Snowdonia National Park and after joins the river Dee at Bala. One of the main tributaries of the Dee, it was dammed in 1965 to form Llyn Celyn, drowning the ...

(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 : ''For the river which flows into Bala Lake see Afon Llafar (Dee)'' Afon Llafar is a river in the Carneddau, Snowdonia. It rises where many streams flow down the slopes of Yr Elen, Carnedd Llewelyn and Carnedd Dafydd to join together in the ...

(L) (flows into

Bala Lake Bala Lake ( cy, Llyn Tegid ) is a large freshwater glacial lake in Gwynedd, Wales. The River Dee, which has its source on the slopes of Dduallt in the mountains of Snowdonia, feeds the long by wide lake. It was the largest natural body of ...

) **

Afon Twrch The Afon Twrch is a river which rises in the Black Mountain in south Wales. It forms the boundary between the counties of Brecknockshire (currently administered as part of the unitary authority of Powys) and Carmarthenshire and, downstream of ...

(R) ** Afon Lliw (L)

Clwyd catchment

River Clwyd The River Clwyd ( Welsh: ''Afon Clwyd'') is a river in Wales that rises in the Clocaenog Forest () northwest of Corwen. Its total length is . It flows due south until, at Melin-y-wig, it veers north-eastwards, tracking the A494 and passing ...

(Afon Clwyd) ** Afon Gele (L) **

River Elwy The River Elwy (''Afon Elwy'' in Welsh) is a river in Wales forming a tributary to the River Clwyd. The source of the river is sometimes said to be on the northern flank of Moel Seisiog, south-east of Llanrwst, at Ordnance Survey grid referenc ...

(L) (Afon Elwy)(Also known as Afon Cledwen above the village of Llangernyw) *** Afon Meirchion (R) *** River Aled (R) ***

Afon Gallen 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 upstrea ...

(Ls) **

River Wheeler The River Wheeler (Welsh: ''Afon Chwiler'') is a tributary of the River Clwyd in north-east Wales. Rising on the east side of the Clwydian Range, it is a "misfit stream" occupying a deep valley cutting westwards through the range into the Vale ...

(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

River Conwy , name_etymology = , image = Boats in River Conwy.jpg , image_size = 300 , image_caption = Boats in the river estuary at Conwy , map = , map_size = , map_caption = , pus ...

(Afon Conwy) ** Afon Gyffin (L) **

Afon Roe The Afon Roe is a small river in Snowdonia in north-west Wales. Its tributary is the Afon Tafolog, which drains the eastern slopes of Drum, a mountain in the Carneddau range. The river flows through the village of Rowen before joining the Riv ...

(L) (known as Afon Tafolog in upper reaches) **

Afon Dulyn Afon Dulyn (English : ''River Dulyn)'' is the outflow from Llyn Dulyn, a lake in the Carneddau mountains in north-west Wales. It is a tributary of the river Conwy. Just below Afon Dulyn the river is joined by Afon Melynllyn, a small river fl ...

(L) *** Afon Ddu (L) *** Afon Garreg-wen (L) *** Ffrwd Cerriguniawn (L) ***

Afon Melynllyn Afon Melynllyn is the outflow from Llyn Melynllyn, a lake in the Carneddau mountains in north-west Wales. It is a tributary of Afon Dulyn, itself a tributary of the river Conwy , name_etymology = , image = Boats in Ri ...

(R) **

Afon Porth-llwyd Afon Porth-llwyd is a river in Snowdonia in north-west Wales. It flows from Llyn Eigiau on the south-eastern edge of the Carneddau range to join the river Conwy. Its waters are trapped at Coedty reservoir before flowing down to pass under Po ...

(L) *** Afon Eigiau ** Afon Ddu (L) **

Afon Crafnant The Afon Crafnant ( en, italic=yes, River Crafnant) is a tributary of the River Conwy (''Afon Conwy'' in Welsh), which is the main river of the Conwy valley in north-west Wales. It flows from picturesque Llyn Crafnant, joining the river Co ...

(L) *** Afon Geirionydd (R) **

Afon Gallt y Gwg 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 upstre ...

(R) ** Nant y Goron (R) ** Afon Llugwy (L) *** Nantygwryd (R) ** Afon Lledr (L) *** Afon Wybrnant (R) ***

Afon Maesgwm 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 upstr ...

(R) *** Afon Ystumiau (L) **

Afon Machno River Machno ( cy, Afon Machno) is a river in Snowdonia in north-west Wales. It is the first major tributary of the River Conwy, which it joins south of Betws-y-coed Betws-y-coed (; '' en, prayer house in the wood'') is a village and commun ...

(L) *** Afon Glasgwm (L) ** Afon Iwrch (R) **

Afon Eidda 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 upstre ...

(L) ** Merddwr (R) ** Afon Caletwr (R) ** Afon Serw (R)

Simple coastal catchments

* Afon Gyrach * Afon Ddu ** Afon Glan-sais (L) **

Afon Maes-y-bryn 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 upstre ...

(R)

Aber catchment

Afon Aber The Afon Aber is a small river in Gwynedd that enters Liverpool Bay on the coast of North Wales at Abergwyngregyn, . It rises in the Carneddau mountains on the northern watersheds of Drum, Foel Fras and Garnedd Uchaf and the eastern watershe ...

Afon Anafon The Anafon River, or Afon Anafon, is a river in Gwynedd, Wales, that flows into the Afon Aber. It originates on the slopes of Foel-fras and the Drum of the Carneddau. It flows into Glyn Anafon. then north-west along the Anafon Valley, flowing ...

(Rs) ** Afon Rhaeadr Fawr (Ls) *** Afon Rhaeadr Bach (Ls) **** Afon Gam (L) *** Afon Goch (Rs)

Ogwen catchment

* Afon Ogwen ** Afon Caseg (R) ***

(L) ***

Afon Denau 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 upstrea ...

(flows into

Llyn Ogwen Llyn Ogwen (; ) is a ribbon lake in north-west Wales. It lies alongside the A5 road between two mountain ranges of Snowdonia, the Carneddau and the Glyderau. Somewhat unusually, the county boundary at this point is drawn so that the lake its ...

) **** Nant Gwern y Gof (L) *** Afon Lloer (flows into

)

Cegin catchment

* River Cegin (Afon Cegin)

Adda catchment

* River Adda (Afon Adda)

Isle of
Anglesey Anglesey (; cy, (Ynys) Môn ) is an island off the north-west coast of Wales. It forms a principal area known as the Isle of Anglesey, that includes Holy Island across the narrow Cymyran Strait and some islets and skerries. Anglesey island ...
rivers

Anticlockwise from

Menai Bridge Menai Bridge ( cy, Porthaethwy; usually referred to colloquially as Y Borth) is a town and community on the Isle of Anglesey in north-west Wales. It overlooks the Menai Strait and lies by the Menai Suspension Bridge, built in 1826 by Thom ...

/ Porthaethwy

Minor coastal catchments

* Afon Cadnant (River Cadnant) * Nant Meigan * Lleiniog * Afon Nodwydd * Afon y Marchogion *

Afon Lligwy 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 upstr ...

* Nant Perfedd * Afon Goch (Dulas) * Nant y Beddyw * Afon Bryn Gwyn * Afon Goch (Amlwch) * Afon Wygyr * Gwter Fudr *

Afon Alaw The Afon Alaw ( en, River Alaw) is a river on Anglesey (Welsh: Ynys Môn) in Wales which rises near Llanerch-y-medd and flows northwards into the reservoir of Llyn Alaw. Below the dam it then flows southwestwards to the island's west coast near L ...

(River Alaw)

Crigyll catchment

Afon Crigyll 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 upstrea ...

Afon Caradog 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 upstre ...

(L)

Ffraw catchment

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

Cefni catchment

Afon Cefni Afon Cefni is one of the major rivers on the island of Anglesey, Wales. It is long. Its source is near to the village of Capel Coch, before flowing through Bodffordd and into Llyn Cefni in the centre of the island. It continues to run south th ...

(River Cefni) ** Afon Newydd (L) **

Afon Ceint 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 upstrea ...

(L) ** Afon Erddreiniog (L) (flows into

Cefni Reservoir Llyn Cefni is a small reservoir in the centre of Anglesey, Wales which is managed by Welsh Water and Hamdden Ltd, while the fishery is managed by the Cefni Angling Association. The reservoir is located just northwest of the island's county town ...

)

Braint (i) catchment

The Afon Braint bifurcates near

Llanfairpwllgwyngyll Llanfairpwllgwyngyll, or Llanfair Pwllgwyngyll (), is a large village and local government community on the island of Anglesey, Wales, on the Menai Strait next to the Britannia Bridge and across the strait from Bangor. Both shortened (Llanf ...

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 technically a river, despite its Welsh name.''.

Mainland rivers flowing into the Menai Strait and
Caernarfon Bay Caernarfon Bay (occasionally Caernarvon Bay) is an inlet of the Irish Sea defined by the Llŷn peninsula and Anglesey. The gentle coastline surrounding it is home to villages including Nefyn, Pistyll, Trefor, Gwynedd, Trefor, Llithfaen , and ...

''From Bangor Pier to the tip of the

Llŷn Peninsula The Llŷn Peninsula ( cy, Penrhyn Llŷn or , ) extends into the Irish Sea from North West Wales, south west of the Isle of Anglesey. It is part of the historic county of Caernarfonshire, and historic region and local authority area of Gwynedd. Mu ...

Seiont catchment

Afon Seiont Afon Seiont (Welsh, meaning ''River Seiont'' in English) is a river in Gwynedd, Wales which runs into the Menai Strait. Its source is the outflow of Llyn Padarn near Llanberis, and it flows out in a generally northwest direction. Between th ...

(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 The Afon Llyfni is a small river in North Wales which arises as Nant Drws y Coed between Mynydd Mawr and Mynydd Drws-y-Coed just to the west of Snowdon. The main river forms at the outlet of the Llyn Nantlle Uchaf and flows past the great sl ...

, Lleyn *

Afon Desach 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 upstrea ...

* Afon Hen * Nant Gwrtheyrn * Afon Geirch * Afon Amwlch * Afon Pen-y-graig

Rivers flowing into
Cardigan Bay Cardigan Bay ( cy, Bae Ceredigion) is a large inlet of the Irish Sea, indenting the west coast of Wales between Bardsey Island, Gwynedd in the north, and Strumble Head, Pembrokeshire at its southern end. It is the largest bay in Wales. Geo ...

''From the tip of the

to St. David's Head'' *

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

Daron catchment

* Afon Daron ** Afon Cyllyfelin (R)

Soch catchment

* Afon Soch **

Afon Horon 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 upstre ...

(L)

Rhyd-hir catchment etc

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

Afon Wen Afon Wen is a small hamlet on the Llŷn peninsula in the Welsh principal area of Gwynedd. Location It is located at the mouth of the Afon Wen river, half a mile from the village of Chwilog and midway between Pwllheli and Cricieth. History ...

Dwyfor catchment

Afon Dwyfor The Afon Dwyfor is a river in Gwynedd, north-west Wales, in total the river is in length. It rises in Cwm Dwyfor at the head of Cwm Pennant, gathers to itself numerous streams which drain the surrounding mountains from Mynydd Graig Goch in ...

** Afon Dwyfach (R) **

Afon Henwy The Afon Dwyfor is a river in Gwynedd, north-west Wales, in total the river is in length. It rises in Cwm Dwyfor at the head of Cwm Pennant, gathers to itself numerous streams which drain the surrounding mountains from Mynydd Graig Goch in th ...

(L)

Glaslyn catchment

* Afon Glaslyn **

Afon Dylif 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 upstrea ...

*** Afon Croesor (L) ** Nantmor (L) ** Afon Colwyn (R) **

Afon Llynedno 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 upstre ...

(L) *

Afon Dwyryd The River Dwyryd ( cy, Afon Dwyryd, meaning a river of two fords) is a river in Gwynedd, Wales which flows principally westwards; draining to the sea into Tremadog Bay, south of Porthmadog. Geography The Dwyryd rises in the hills to the north of ...

(Headwaters are disputed to be the Afon Goedol) ** Afon y Glyn (L) **

Afon Prysor The River Dwyryd ( cy, Afon Dwyryd, meaning a river of two fords) is a river in Gwynedd, Wales which flows principally westwards; draining to the sea into Tremadog Bay, south of Porthmadog. Geography The Dwyryd rises in the hills to the north of ...

(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 The Afon Mawddach ( en, River Mawddach, italic=yes) is a river in Gwynedd, Wales, which has its source in a wide area north of Dduallt in Snowdonia. It is 28 miles (45 km) in length, and is much branched; many of the significant tribu ...

Afon Dwynant 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 upstrea ...

(R) ** Afon Gwynant (L) ** Afon Cwm-llechen (R) ** Afon Cwm-mynach (R) **

Afon Wnion The River Wnion is a river in the southeast of Gwynedd, Wales. It begins high on the slopes of Aran Benllyn about five miles south of Lanuwchllyn and flows south-west into the River Mawddach near Cymer Abbey. It flows past several villages, inc ...

(L) ***

Afon Clywedog The Afon Clywedog is an upland headwater tributary of the River Severn in Powys, Wales. It is approximately 29 km long and has its source on the flanks of Plynlimon and has its confluence with the Severn in Llanidloes. The annual rainfall ...

(L) *** Afon Celynog (L) **

(L) **

Afon Gamlan 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 upstrea ...

(R) **

Afon Eden Afon Eden is a tributary river than runs into the Afon Mawddach in Gwynedd, Wales. It is a protected river because it is one of the few breeding grounds for freshwater pearl mussel The freshwater pearl mussel (''Margaritifera margaritifera'' ...

(R) *** Afon Crawcwellt (R) **

Afon Gain 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 upstrea ...

(R)

Dysynni catchment

* Afon Dysynni (R) ** Afon Fathew (L) ** Afon Cadair (R) ** Nant Gwernol (L)

Dyfi catchment

River Dyfi The River Dyfi ( cy, Afon Dyfi; ), also known as the River Dovey (; ), is an approximately long river in Wales. Its large estuary forms the boundary between the counties of Gwynedd and Ceredigion, and its lower reaches have historically been c ...

(River Dovey) **

Afon Leri The Afon Leri ( en, River Leri) is a river in Ceredigion, Wales. It rises at Llyn Craig-y-Pistyll and is joined at Talybont by Afon Ceulan before passing behind Borth to its mouth in the Dyfi estuary at Ynyslas. The river once flowed into Ca ...

(L) ***

Afon Ceulan 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 upstr ...

(R) ** Afon Einion (L) ** Afon Llyfnant (L) **

Afon Dulas The Afon Dulas, or North Dulas, is a river forming the border between Merionethshire/Gwynedd and Montgomeryshire/Powys in Wales. Another river called Afon Dulas joins the Dyfi from the south, upstream of its confluence with the North Dulas: loca ...

(R) (North Dulas) ***

Afon Deri The Afon Deri (sometimes known as the ''Afon Corris'') is a river in Mid Wales. It flows from the eastern flank of Mynydd Ty-Glas down to Corris, where it joins the Afon Dulas that flows south to the Afon Dyfi. The river passes through the vil ...

(R) ***

Nant Ceiswyn The Nant Ceiswyn (sometimes known as the ''Afon Ceiswyn'') is a small river in Mid Wales. It flows from the northern flank of Mynydd Dolgoed down to Pont Cymerau, north-east of Aberllefenni. Here it joins the Nant Llwydiarth to form the Afon Dul ...

(R) **

(L) (South Dulas) **

Afon Twymyn The Afon Twymyn ( en, River Twymyn, italic=yes) is a river in Powys, Mid Wales. From its source at the 40-metre high Ffrwd Fawr waterfall and head of the Pennant Valley near Dylife the river flows through Llanbrynmair before joining the Rive ...

(L) ***

Afon Rhiwsaeson 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 upstr ...

(R) **** Afon Laen (L) **

Afon Angell The Afon Angell is a river in Gwynedd, Mid Wales. The river flows eastwards from its source on the eastern flank of Mynydd Dolgoed, joining the Afon Dyfi at the small village of Aberangell. The river was known for its salmon and trout fish ...

(R) **

Afon Cleifion 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 upstr ...

(L) ***

Afon Dugoed 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 upstr ...

(Rs) ***

Afon Tafolog The Afon Tafolog is a small river in Snowdonia in north-west Wales. It is fed by a number of streams which drain the eastern slopes of Drum, a mountain in the Carneddau range. It is a tributary of Afon Roe which then flows through the village of ...

(Ls) ** Afon Cerist (R) **

Afon Cywarch 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 upstre ...

(R)

Clarach catchment

Afon Clarach The Afon Clarach ( en, River Clarach) is a small river discharging into Cardigan Bay north of Aberystwyth. It flows through a largely agricultural and forested landscape except in its lowest reaches where its banks are crowded with holiday devel ...

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

Rheidol catchment

River Rheidol The Afon Rheidol is a river in Ceredigion, Wales, in length. The source is Plynlimon. Receiving an average annual rainfall of , Plynlimon is also the source of both the Wye and the Severn. Geography and geology The Rheidol rises in the head ...

(Afon Rheidol) **

Afon Melindwr 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 upstre ...

(R) ** River Mynach (L) (Afon Mynach) *** Afon Merin (Rs) *** Nant Rhuddnant (Ls) ** Afon Castell (L) **

Afon Llechwedd Mawr 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 upstr ...

(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 The River Ystwyth (; cy, Afon Ystwyth "winding river") is a river in Ceredigion, Wales. The length of the main river is . Its catchment area covers . Its source is a number of streams that include the Afon Diliw, located on the west slopes of ...

(Afon Ystwyth) ** Afon Fâd (L) **

Afon Llanfihangel 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 upstrea ...

(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 Wyre ( ), ( en, River Wyre), is a small river in the county of Ceredigion, Wales; also called Afon Wyre Fawr ("Great Wyre") and formerly Gwyrai. The river runs north from its source for about 1.5 miles or 2.5 km, through Lledrod, ...

** Afon Carrog (R) **

Wyre Fach Wyre may refer to: Places * Wyre, Orkney, an island in Scotland * Borough of Wyre, a local government district in Lancashire, England ** Wyre (UK Parliament constituency) * River Wyre, a river in Lancashire, England * Wyre Forest, a woodland in ...

(L) *** Nant Rhydrosser (L) ***

Afon Tryal 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 upstrea ...

(L) ** Afon Beidog (L)

Cledan catchment

Afon Cledan 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 upstre ...

Arth catchment

* River Arth

Aeron catchment

* Afon Aeron **

Afon Mydr 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 upstr ...

(L) ** Gwenffrwd (R)

Coastal streams

* Afon Drywi *

Afon Soden 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 upstre ...

* Afon Fynnon Ddewi * Nant Hawen * Hoffnant

Teifi catchment

River Teifi , name_etymology = , image = File:Llyn Teifi - geograph.org.uk - 41773.jpg , image_size = , image_caption = Llyn Teifi, the source of the Teifi , map = , map_size = , map_caption ...

(Afon Teifi) ** Afon Piliau (L) ** Nant Arberth (R) **

Afon Cych Afon Cych (standard Welsh orthography: Afon Cuch) is a tributary of the River Teifi in south-west Wales. It is 13 km long, passes through a number of small settlements on the border between Pembrokeshire and Carmarthenshire, and is signific ...

(L) ***

Afon Pedran 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 upstr ...

(L) ***

Afon Sylgen 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 upstre ...

(R) ** Afon Hirwaun (R) ** Nant Elfed (R) **

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

(R) *** Afon Dulas (Lampeter) (R) *** Afon Bedw (L) ** Nant Bargod (L) **

Afon Tyweli 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 upstre ...

(L) *** Afon Talog (R) **

Afon Clettwr 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 upstre ...

(P) *** Clettwr Fawr (Rs) *** Clettwr Fach (Ls) ** Nant Cledlyn (R) ** Afon Duar (L) **

Afon Granell 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 upstrea ...

(R) **

Afon Dulas (Llandyssul) The Afon Dulas, or North Dulas, is a river forming the border between Merionethshire/Gwynedd and Montgomeryshire/Powys in Wales. Another river called Afon Dulas joins the Dyfi from the south, upstream of its confluence with the North Dulas: loca ...

(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 The River Nevern ( cy, Afon Nyfer) is a river in Pembrokeshire, Wales. Its source is north of the village of Crymych and its length is about to its estuary at Newport, Pembrokeshire. Course The source of the river is a spring on the southwest ...

** Nant Duad (R) ** Afon Brynberian (L) ** Afon Bannon (L)

Minor coastal catchments

River Gwaun A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wa ...

(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 The River Solva (Welsh: ''Afon Solfach'') is a small river in Pembrokeshire, Wales. Its source is a few hundred metres southeast of Croesgoch and flows ten miles before reaching Solva Harbour and St Brides Bay. It passes through mainly agricultu ...

(Afon Solfach) * Brandy Brook

Cleddau catchment

* Daugleddau (estuary is Daugleddyf or Milford Haven downstream) **

Pembroke River Pembroke River is a short waterway near Pembroke, Pembrokeshire, West Wales. Course Rising at Hogeston Hill, near Manorbier Newton, the river meanders through Lamphey and flows past Pembroke Castle to its confluence with Milford Haven Waterway a ...

(L) ** Carew River (L) **

Cresswell River Cresswell may refer to: Places England *Cresswell, Northumberland, England **Cresswell Castle, Northumberland or Cresswell Pele Tower, constructed in the 15th century *Cresswell, Staffordshire, near Stoke-on-Trent *Cresswell Quay, a settlement in ...

(L) **

Western Cleddau The River Cleddau ( cy, Afon Cleddau) consists of the Eastern and Western Cleddau rivers in Pembrokeshire, west Wales. They unite to form the Daugleddau estuary and the important harbour of Milford Haven. The name of the combined estuary – ...

(Rs) *** Millin Brook (L) *** Merlin's Brook (R) *** Cartlett Brook (L) *** Knock Brook (R) ****

Camrose Brook Camrose may refer to: ;People *Viscount Camrose ;Locations *Camrose, Alberta, Canada *Camrose, Pembrokeshire, Wales See also *Camrose Trophy The Camrose Trophy or "The Camrose" is an annual bridge competition among open teams representing the ...

(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 The River Cleddau ( cy, Afon Cleddau) consists of the Eastern and Western Cleddau rivers in Pembrokeshire, west Wales. They unite to form the Daugleddau estuary and the important harbour of Milford Haven. The name of the combined estuary – ...

(Ls) ***

Afon Syfynwy River Syfynwy (Welsh: ''Afon Syfynwy'', ''Syfnwy'' or ''Syfni'') is a river entirely within Pembrokeshire, Wales, rising in the Preseli Hills, feeding the Rosebush and Llys y Fran reservoirs and joining the Eastern Cleddau to the south. It is a ...

(R) ***

Afon Wern 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 upstre ...

(R)

Rivers flowing into the Bristol Channel

''From St. Govan's Head to M48 Bridge''

Taf catchment

River Tâf The River Taf ( cy, Afon Taf) is a river in West Wales. It rises in the Preseli Hills, Pembrokeshire, and continues through Carmarthenshire to Laugharne. It is one of the three rivers to enter the sea on the east side of Carmarthen Bay. The oth ...

(Afon Taf) ** River Cywyn (Afon Cywyn) (L) ** Afon Cynin (L) ***

Afon Dewi Fawr 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 upstrea ...

(L) *** Afon Sien (R) ** Afon Fenni (R) **

Afon Gronw 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 upstrea ...

(L) ** Afon Marlais (R)

Towy catchment

Afon Tywi The River Towy ( cy, Afon Tywi, ) is one of the longest rivers flowing entirely within Wales. Its total length is . It is noted for its sea trout and salmon fishing. Route The Towy rises within of the source of the River Teifi on the lower sl ...

(River Towy) **

Afon Gwili : ''For the river which flows into the River Loughor see Afon Gwili (Loughor)'' The River Gwili ( cy, Afon Gwili) in Carmarthenshire, is a tributary of the River Tywi, the longest river entirely in Wales. Its headwater is found east of Llanllaw ...

(R) **

Afon Annell Afon Annell (River Annell) is a small river in Carmarthenshire, Wales. It is a tributary of the Afon Cothi. Some of the waters of the Annell were previously diverted via aqueduct to serve the Roman Roman or Romans most often refers to: * R ...

(R) ** River Cothi (R) (Afon Cothi) *** Afon Gorlech (R) ***

(R) *** Afon Marlais (R) **

(R) ** Afon Cennen (L) **

Afon Sawdde The Afon Sawdde is a river in the county of Carmarthenshire, Wales. For most of its course it flows through the Brecon Beacons National Park and Fforest Fawr Geopark. Llyn y Fan Fach The river rises on the northern slopes of the Black Mountain ...

(L) **

Afon Bran 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 upstrea ...

(L) *** Afon Ydw (R) ** Afon Dulais (R) **

Afon Brân The Afon Brân is a tributary of the River Towy (or Welsh Afon Tywi) in mid Wales. Its headwaters rise in Irfon Forest in the northeastern corner of Carmarthenshire as the Cynnant Fawr and Afon Lwynor and the river assumes the name of Afon Brâ ...

(L) *** Cynnant Fawr (Rs) **** Cynnant Fach (L) *** Afon Lwynor (Ls) *** Afon Crychan (L) ***

Afon Gwydderig The Afon Gwydderig is a tributary of the Afon Brân. It rises as the Nant Gwydderig on the southern slopes of Mynydd Bwlch-y-groes, about North of the small village of Llywel, Powys. The A40 runs next to the river from Llywel as far as Lla ...

(L) ** Afon Gwenlais (R) ** Gwenffrwd (R) *** Nant Melyn (R) **

Afon Doethie 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 upstrea ...

(R) *** Afon Pysgotwr Fawr (R) **** Afon Pysgotwr Fach (R) ** Camddwr (R)

Gwendraeth catchment

River Gwendraeth The River Gwendraeth ( cy, Afon Gwendraeth) is a river in Carmarthenshire in West Wales. It has two almost equal branches that have their confluence in their joint estuary at Carmarthen Bay. The Gwendraeth Fawr (''large Gwendraeth'' in English) ...

Gwendraeth Fach The River Gwendraeth ( cy, Afon Gwendraeth) is a river in Carmarthenshire in West Wales. It has two almost equal branches that have their confluence in their joint estuary at Carmarthen Bay. The Gwendraeth Fawr (''large Gwendraeth'' in English) ...

(Rs) ** Gwendraeth Fawr (Ls)

Lliedi catchment

River Lliedi The River Lliedi ( cy, Afon Lliedi) has its source near Mynydd Sylen Llanelli and Llannon in Carmarthenshire, Wales. The river fills the Cwm-Lliedi Reservoirs and meets the sea at the Loughor Estuary (Welsh-Moryd Llwchwr) at the former Carmarthe ...

(Afon Lliedi)

Loughor catchment

* River Loughor (Afon Llwchwr) ** Burry Pill (L) ** Afon Lliw (L) ***

Afon Llan 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 upstrea ...

(L) **

(R) ** River Amman (L) ** Afon Lash (R) ** Afon Morlais (R) ** Afon Dulais ** Afon Camffrwd

Clyne catchment

Clyne River The Clyne River ( cy, Afon Clun) is a river in Swansea, south Wales. It has a total length of , and flows through the Clyne Valley Country Park for much of its length. Course The river rises from a series of springs on the northern fringe of F ...

Tawe catchment

River Tawe The River Tawe (; cy, Afon Tawe ) is a long river in South Wales. Its headwaters flow initially east from its source below Llyn y Fan Fawr south of Moel Feity in the Black Mountains, the westernmost range of the Brecon Beacons National ...

** Nant y fendrod (L) ** Lower Clydach River (R) ** Upper Clydach River (R) *** River Egel (L) **

(R) ***

Nant Gwys The Nant Gwys is a river flowing off the Black Mountain (Y Mynydd Du) in Powys, Wales. Its tributaries Gwys Fawr and the Gwys Fach flow south from Banwen Gwyn and Bwlch y Ddeuwynt respectively and join forces to form the Nant Gwys proper which ...

(L) **** Gwys Fawr (Ls) **** Gwys Fach (Rs) *** Nant Llynfell (R) *** Nant y Llyn (R) **

River Giedd The River Giedd (Welsh:Afon Giedd) is a principal tributary of the River Tawe, Wales. The river runs within the county of Powys and lies almost wholly within the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog). This river is p ...

(R) *** Nant Cyw (L) *** Nant Ceiliog (L) **

Nant Llech The Nant Llech is a minor river in Powys, Wales and which lies wholly within the Brecon Beacons National Park. The name means 'slab stream', presumably in reference to the sandstones across which it runs. Its headwater streams, the Nant Llech Pell ...

(L) *** Nant Llech Pellaf (L) ** River Haffes (R) ** Nant Byfre (L) ** Nant y Llyn (R)

Neath catchment

River Neath River Neath ( cy, Afon Nedd) is a river in south Wales running south west from the point at which its headwaters arising in the Brecon Beacons National Park converge to its mouth at Baglan Bay below Briton Ferry on the east side of Swansea Ba ...

** River Clydach (R) ** River Dulais (R) ** Melin Cwrt Brook (L) ** Clydach Brook (L) **

Nedd Fechan The Nedd Fechan is a river almost wholly within the county of Powys, Wales, currently administered as part of the unitary authority of Powys. It rises on the eastern slopes of Fan Gyhirych in the Fforest Fawr section of the Brecon Beacons National ...

(Rs) ***

Afon Pyrddin The Afon Pyrddin is a river forming a short section of the boundary between the counties of Brecknockshire and Glamorgan in Wales, Great Britain. It also forms a part of the boundary of the Brecon Beacons National Park, and the boundary of the unit ...

(R) **

Afon Mellte Afon Mellte or the River Mellte is a river in south Wales. It is formed by the confluence of the Afon Llia and the Afon Dringarth. It then flows south through the village of Ystradfellte to Pontneddfechan where it joins with the Nedd Fechan ...

(Ls) ***

Sychryd The Afon Sychryd is a river in Rhondda Cynon Taf, Wales. Although it is a relatively short river, with a total length of , it is notable for the gorge and two waterfalls through which it flows. Course The river has two upper arms, the first arise ...

(L) ***

Afon Hepste The Afon Hepste is a river in Powys, Wales, though partly forming the county's border with Rhondda Cynon Taf. It runs wholly within the Brecon Beacons National Park. Its headwaters, the Afon y Waun, Nant y Cwrier and Nant Hepste Fechan, rise ...

(L) *** Afon Llia (Rs) ***

Afon Dringarth The Afon Dringarth (or simply ''Tringarth'') is a river in Powys, Wales and wholly contained within the Brecon Beacons National Park. Its headwater streams drain the eastern slopes of Fan Dringarth (which is probably named after the river), the ...

(Ls)

Afan catchment

River Afan , name_etymology = , image = The_Afon_Afan,_Cymmer_-_geograph.org.uk_-_1001060.jpg , image_size = , image_caption = The Afan near Cymmer , map = , map_size = , map_caption ...

** Ffrwd Wyllt (L) ** Nant Cwm Wenderi ** Afon Pelenna (R) ** Nant Cregan **

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

(R) ***

Afon Corrwg Fechan 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 upstrea ...

(R)

Kenfig catchment

River Kenfig The River Kenfig ( cy, Afon Cynffig) is a river in Wales, straddling the county boroughs of Neath Port Talbot and Bridgend. It is approximately 18 kilometres long. Course The river rises in the forest of Mynydd Margam, southwest of Maesteg. Fro ...

(Afon Cynffig)

Ogmore catchment

River Ogmore The River Ogmore ( cy, Afon Ogwr) is a river in South Wales that is popular with anglers. It runs generally from north to south from the Ogmore Vale and Gilfach Goch, past Bridgend and Ogmore. The River Ogmore rises at Craig Ogwr (527 m) in th ...

(Afon Ogwr) **

River Ewenny The Ewenny River ( cy, Afon Ewenni) is a river in South Wales. For most of its length, it forms the border between the Vale of Glamorgan and Bridgend. It is a major tributary of the River Ogmore, which it joins near its estuary. Course The riv ...

(L) ***

Afon Alun The Afon Alun is a river in the Vale of Glamorgan, south Wales. It is a tributary of the Ewenny River, which it joins to the south of Bridgend Bridgend (; cy, Pen-y-bont ar Ogwr or just , meaning "the end of the bridge on the Ogmore") is ...

(L) *** Afon Ewenny Fach (L) *** Nant Canna (L) *** Nant Crymlyn (R) **

River Llynfi The River Llynfi, cy, Afon Llynfi, is one of three main tributaries of the River Ogmore ( cy, Afon Ogwr). It runs for around 10 miles from its source north of Maesteg and flows generally southwards through the Llynfi Valley to the confluence ...

(R) *** Nant y Gadlys (R) *** Nant Cwm-du (L) ** Afon Garw (R) ** Afon Ogwr Fawr (Rs) **

Afon Ogwr Fach 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 upstrea ...

(Ls) *** Nant Iechyd (R)

Col-huw catchment

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

Thaw catchment

River Thaw The River Thaw ( cy, Afon Ddawan) (also Ddaw) is a river in the Vale of Glamorgan, south Wales. At 20 kilometres/12.4 miles, it is the longest river entirely in the Vale of Glamorgan. Course Its source is in the hills just south of th ...

Kenson River Kenson may refer to: *River Kenson, a river of South Wales *Steve Kenson (born 1969), writer and designer of fantasy role-playing games and related fiction *Kenson Park, a neighborhood in Ot ...

(L) *** River Waycock (Ls) *** Nant Llancarfan (Rs) ** Nant y Stepsau (R)

Cadoxton catchment

* Cadoxton River ** Sully Brook (L) ** Cold Brook, Cadoxton (R) *** Nant yr Argae (L) **

East Brook, Cadoxton East or Orient is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the fa ...

(L) ** Bullcroft Brook (Ls) **

Wrinstone Brook Wrinstone or Wrinston ( cy, Wrinstwn) is a medieval hamlet, just east of Wenvoe, Vale of Glamorgan, south Wales. The Wrinstone estate was variously also known as Wrenston, Wrencheston or Wrenchester. The Barry Railway line ran past the hamlet and ...

(Rs)

Taff catchment

(Afon Taf) **

River Ely The River Ely ( cy, Afon Elái) is in South Wales flowing generally southeast, from Tonyrefail to Cardiff. The river is about long. The Ely's numerous sources lie in the mountains to the south of Tonypandy, near the town of Tonyrefail, ri ...

(Afon Elái) (R) ***

Afon Clun The Afon Clun ( en, River Clun) is a long tributary of the River Ely ( cy, Afon Elái), in the counties of Cardiff and Rhondda Cynon Taf, Wales. Its bedrock is predominantly of sandstone. Beginning on the western slope of The Garth (') the ri ...

(L) (Nant Myddlyn in upper reaches) ** River Rhondda (R) (Afon Rhondda) ***

Rhondda Fawr Rhondda , or the Rhondda Valley ( cy, Cwm Rhondda ), is a former coalmining area in South Wales, historically in the county of Glamorgan. It takes its name from the River Rhondda, and embraces two valleys – the larger Rhondda Fawr valley ...

(Ls) ***

Rhondda Fach Rhondda , or the Rhondda Valley ( cy, Cwm Rhondda ), is a former coalmining area in South Wales, historically in the county of Glamorgan. It takes its name from the River Rhondda, and embraces two valleys – the larger Rhondda Fawr valley ('' ...

(Rs) ***

River Ritec A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wat ...

(Afon Ritec) ** Nant Clydach (R) **

River Cynon The River Cynon ( cy, Afon Cynon) in South Wales is a main tributary of the Taff. Its source is the rising of Llygad Cynon (OS grid ref SN 95240 07740) at above sea level at Penderyn, Rhondda Cynon Taf and flows roughly southeast, into the Ta ...

(R) (Afon Cynon) *** Aman River *** Afon Dar ***

Afon Pennar 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 upstrea ...

** Bargoed Taf (L) ** Nant Morlais **

Taf Fechan The River Taff ( cy, Afon Taf) is a river in Wales. It rises as two rivers in the Brecon Beacons; the Taf Fechan (''little Taff'') and the Taf Fawr (''great Taff'') before becoming one just north of Merthyr Tydfil. Its confluence with the R ...

(Ls) ** Nant Ffrwd (Rs)

Rhymney catchment

Rhymney River The Rhymney River ( cy, Afon Rhymni) is a river in the Rhymney Valley, South Wales, flowing through Cardiff into the Severn Estuary. The river formed the boundary between the historic counties of Glamorgan and Monmouthshire until in 1887, ...

(Afon Rhymni) ** Nant Bargod Rhymni (R)

Usk catchment

* River Usk (Afon Wysg) **

Ebbw River The Ebbw River (; cy, Afon Ebwy) is a river in South Wales which gives its name to the town of Ebbw Vale. The Ebbw River is joined by the Ebbw Fach River ( Welsh: Afon Ebwy Fach meaning 'little Ebbw river') at Aberbeeg. The Ebbw Fach is itself ...

(R) (Afon Ebwy) ***

Sirhowy River The Sirhowy River (Welsh language : ''Afon Sirhywi'') is a river in Wales and a tributary of the Ebbw River. Sources The Sirhowy River has its source on the slopes of Cefn Pyllau-duon above Tredegar. After flowing through Siôn-Sieffre's Res ...

(R) *** River Ebbw Fach (L) ** Afon Llwyd (R) ** Sôr Brook (R) **

Olway Brook The Olway Brook (Welsh: ''Nant Olwy'') is a left bank tributary of the River Usk in Monmouthshire in south Wales. Arising from the confluence of several brooks in the vicinity of Llansoy including the Llangofen, Penarth and Pontyrhydan brooks, it ...

(L) ** Berthin Brook (R) ** Afon Gafenni (L) (River Gavenny) *** Afon Cibi (R) ** River Clydach (R) **

Grwyne Fawr The Grwyne Fawr is a river in the Brecon Beacons National Park in south Wales. A section of it forms the administrative border between Powys and Monmouthshire and also of the historic counties of Brecon and Monmouth. The river and its major tri ...

(L) *** Grwyne Fechan (R) **

Rhiangoll The Rhiangoll is a river in the Brecon Beacons National Park in Powys, Wales. It rises on the western slopes of Waun Fach, highest point of the Black Mountains (Welsh: Y Mynyddoedd Duon) and drops steeply down to the west into the north–south ...

(L) ** Nant Cleisfer (R) ** Afon Crawnon (R) ** Caerfanell (R) ** Nant Menasgin (R) ** Afon Cynrig (R) ** River Honddu (L) ** Afon Tarell (R) *** Nant Cwm Llwch ** 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 The River Monnow ( cy, Afon Mynwy) marks the England–Wales border for much of its length. After flowing through southwest Herefordshire, England, and eastern Monmouthshire, Wales, its confluence with the River Wye is approximately south of ...

(Afon Mynwy) (R) *** River Dore (L) **** Dulas Brook (R) **** Worm Brook (L) *** River Honddu (R) *** Olchon Brook (R) *** Escley Brook (L) **

River Lugg The River Lugg ( cy, Afon Llugwy) rises near Llangynllo in Radnorshire, Wales. It flows through the border town of Presteigne and then through Herefordshire, England, where it meets its main tributary, the River Arrow, to the south of Leomi ...

(L) (Afon Llugwy) *** River Frome (L) ***

River Kenwater The River Kenwater or simply Kenwater is a short anabranch of the River Lugg, i.e. it splits from and later re-joins that river. It separates from it about 2 kilometres north-west of Leominster Leominster ( ) is a market town in Herefordshi ...

*** River Arrow (R) **** Cynon Brook ***** Gilwern Brook **** Gladestry Brook ** Dulas Brook (R) ** Afon Llynfi (R) *** River Ennig (R) *** Dulas (L) **** Triffrwd (L) **

Bachawy The Bachawy ( cy, Nant Bachawy) (or Bach Howey on Early Ordnance Survey maps.) is a minor river in Powys, Wales. It rises in the hills north of Painscastle, flowing initially to the southeast before turning to the southwest at Rhos-goch, assumin ...

(L) ** Afon Edw (L) **

Duhonw Duhonw is a rural community in Powys, Wales, to the south of Builth Wells ( cy, Llanfair ym Muallt), in the historic county of Breconshire. Covering an area of and including scattered farms and dwellings, it is bounded to its north by the Afon I ...

(R) **

Afon Irfon Afon Irfon (the River Irfon) is a river in Powys, Wales. It flows from the upper slopes of Bryn Garw in the Cambrian Mountains, through the Abergwesyn Valley, past the Nant Irfon National Nature Reserve in the hills above the village of Abergwesy ...

(R) *** Afon Chwerfri (L) *** Dulas (L) ***

Afon Cammarch 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 upstre ...

(L) ***

(R) *** Afon Gwesyn (L) ** Dulas Brook (L) **

River Ithon A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

(L) (Afon Ieithon) *** Dulas (R) *** Clywedog Brook (R) *** Afon Aran (L) *** Camddwr (L) **

Afon Elan The Afon Elan ( en, River Elan) is a tributary of the River Wye which runs through the wide expanse of upland moors, traditionally known as Elenydd, in central Wales. Its valley is the Elan Valley. The name probably arises from ''elain'' meani ...

(R) ***

Afon Claerwen 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 upstre ...

(R) **** Rhiwnant (R) **** Afon Arban (R) **** Afon Claerddu (R) ***

Afon Gwngu 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 upstrea ...

(R) ** Afon Marteg (L) ** Afon Bidno (L) ** Afon Tarennig (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 This is a list of rivers of England, organised geographically and taken anti-clockwise around the English coast where the various rivers discharge into the surrounding seas, from the Solway Firth on the Scottish border to the Welsh Dee on the Wel ...

. *

River Severn , name_etymology = , image = SevernFromCastleCB.JPG , image_size = 288 , image_caption = The river seen from Shrewsbury Castle , map = RiverSevernMap.jpg , map_size = 288 , map_c ...

(Afon Hafren), Bristol Channel (Mor Hafren) **

Rea Brook The name Rea Brook can refer to either of two brooks in Shropshire, England. One of the brooks, which eventually becomes the River Rea, is in southern Shropshire. It is to the east of Brown Clee Hill. The other, described here, is a minor r ...

(R) (small parts of upper catchment in Wales) **

River Vyrnwy The River Vyrnwy ( cy, Afon Efyrnwy, ) is a river which flows through northern Powys, Wales, and Shropshire, England. The name derives from Severn, the river of which it is a tributary. Course The river used to be sourced from the many rivers ...

(L) (Afon Efyrnwy) (lowermost section in England) ***

Afon Tanat Afon Tanat is a river in northern Powys, Wales. Its source is close to the Cyrniau Nod mountain, to the north of Lake Vyrnwy. The river flows in a generally east-south-east direction until it joins the River Vyrnwy near Llansantffraid-ym-Mech ...

(L) (lowermost section in England) ****

Cynllaith Cynllaith or Cynllaeth was a ''cwmwd'' (commote) of north east Wales in the cantref of Swydd y Waun which was once part of the Kingdom of Powys and later part of the smaller kingdom of Powys Fadog. Cynllaith, or at least the part of it called '' ...

(L) (part forms the border between Wales and England) ***** Afon Ogau **** Afon Iwrch (L) **** Afon Rhaeadr (L) ****

Afon Eirth 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 upstre ...

(L) *** Afon Cain (L) **** Nant Fyllon (Ls) **** Nant Alan (Rs) ***

Afon Banwy The River Banwy is a river about long in Powys, Wales. It is a tributary of the River Vyrnwy. The Banwy rises in the hills near the pass which takes the A458 road between Mallwyd and Welshpool. The river is called Nant Cerrig-y-groes at its ...

(R) (a.k.a. Afon Einion) **** Afon Einion (R) **** Afon Gam (R) ****

(L) ** Maerdy Brook (L) ** New Cut/Guilsfield Brook (L) ** Luggy Brook (L) ** Camlad (R) (partly in England) ** River Rhiw (Afon Rhiw) (L) ***

Afon Rhiw 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 upstr ...

(north fork) (Rs) ***

(south fork)(Ls) ** Llifior Brook (L) ** The Mule (R) (Afon Miwl) ** Bechan Brook (L) ** Mochdre Brook (R) ** Nant Rhyd-ros lan?? **

Afon Carno The River Carno ( cy, Afon Carno) is a river in Powys, mid Wales, and a tributary of the River Severn. The river is named after the village of Carno, which is close to the source in the foothills of the Cambrian Mountains. From Carno it flows ...

(L) *** Afon Cerniog (R) ***

(R) ** Afon Trannon (L) *** Afon Cerist (R) **** Colwyn Brook (L) ** Nant Feinion (R) ** Wigdwr Brook (L) **

(L) *** Afon Biga (R) (flows into

Clywedog Reservoir The Clywedog Reservoir ( cy, Llyn Clywedog) is a reservoir near Llanidloes, Wales on the head-waters of the River Severn. The construction of the reservoir was enabled by an Act of Parliament which asserted that ''"At certain times the flow o ...

) *** Afon Llwyd (R) (flows into

) **

(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.Encyclopædia Britannica. 1911. "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.

References

{{Authority control

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 upstrea ...

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 Anglesey (; cy, (Ynys) Môn ) is an island off the north-west coast of Wales. It forms a principal area known as the Isle of Anglesey, that includes Holy Island across the narrow Cymyran Strait and some islets and skerries. Anglesey island ... rivers

Minor coastal catchments

Crigyll catchment

Ffraw catchment

Cefni catchment

Braint (i) catchment

Braint (ii) catchment

Seiont catchment

Gwyrfai catchment

Simple coastal catchments

Rivers flowing into Cardigan Bay Cardigan Bay ( cy, Bae Ceredigion) is a large inlet of the Irish Sea, indenting the west coast of Wales between Bardsey Island, Gwynedd in the north, and Strumble Head, Pembrokeshire at its southern end. It is the largest bay in Wales. Geo ...

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

Isle of
Anglesey Anglesey (; cy, (Ynys) Môn ) is an island off the north-west coast of Wales. It forms a principal area known as the Isle of Anglesey, that includes Holy Island across the narrow Cymyran Strait and some islets and skerries. Anglesey island ...
rivers

Rivers flowing into
Cardigan Bay Cardigan Bay ( cy, Bae Ceredigion) is a large inlet of the Irish Sea, indenting the west coast of Wales between Bardsey Island, Gwynedd in the north, and Strumble Head, Pembrokeshire at its southern end. It is the largest bay in Wales. Geo ...