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 mile ...

to the M48 Bridge that separates the estuary of the

River Wye The River Wye (; cy, Afon Gwy ) is the fourth-longest river in the UK, stretching some from its source on Plynlimon in mid Wales to the Severn estuary. For much of its length the river forms part of the border between England and Wales ...

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_ ...

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 drainage ...

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.. ...

(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 the ...

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 ...

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 Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

(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

Garth Pier Garth Pier is a Grade II listed structure in Bangor, Gwynedd, Wales. At in length, it is the second-longest pier in Wales, and the ninth longest in the British Isles. Construction Designed by J.J. Webster of Westminster, London, the pier has ...

Bangor, Gwynedd Bangor (; ) is a cathedral city and community in Gwynedd, North Wales. It is the oldest city in Wales. Historically part of Caernarfonshire, it had a population of 18,322 in 2019, according to the Office for National Statistics. Landmark ...

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 Na ...

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

River Cegidog The River Cegidog () is a river in north-east Wales. It flows mainly through Flintshire but towards the end of its course it forms the border between Flintshire and Wrexham County Borough. Its source lies in the hills of southernmost Flintshire ...

(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 ent ...

(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.'' Ca ...

(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 ...

(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 Ffer ...

(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 upstre ...

(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 ...

(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 upstrea ...

(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 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 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 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 Llynor 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 Ceidiog 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) ** 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 th ...

(L) (River Tryweryn) ***

Afon Mynach (Dee) The Afon Mynach ( en, River Mynach) is a small river in Ceredigion, Wales. Its source is at the meeting of two smaller rivers, the Nant Rhuddnant and the Afon Merin. Both of these streams have their sources in lakes high on the Cambrian Mountain ...

(L) ***

Afon Hesgyn 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 ups ...

(L) ***

Afon Gelyn 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) (flows into

Llyn Celyn Llyn Celyn () is a reservoir constructed between 1960 and 1965 in the valley of the River Tryweryn in Gwynedd, Wales. It measures roughly long by wide, and has a maximum depth of . It has the capacity to hold of water. It was originally ...

) *** 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 Y ...

(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 language, 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 ...

(L) (Afon Elwy)(Also known as Afon Cledwen above the village of Llangernyw) ***

Afon Meirchion 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) ***

River Aled The River Aled, a small river near Conwy County Borough, flows into River Elwy. The river originates at Llyn Aled on Mynydd Hiraethog Denbigh Moors ( Welsh: Mynydd Hiraethog) is an upland region in Conwy and Denbighshire in north-east ...

(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 o ...

(R) (Afon Chwiler) **

Afon Ystrad 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) ** 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 = , push ...

(Afon Conwy) **

Afon Gyffin The Afon Gyffin ("River Gyffin") is a river in Conwy County Borough. Geography The river runs into the River Conwy close to Conwy Castle. An area of ancient semi-natural woodland exists close to the Afon Gyffin, called Coed Merchlyn. The geo ...

(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 ...

(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 flo ...

(L) ***

Afon Ddu (Welsh for ''black river'') is the name of several rivers in Snowdonia in north-west Wales: * The largest of these flows from Llyn Cowlyd on the south-eastern edge of the Carneddau range to join the river Conwy, passing Pont Dolgarrog on the ...

(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. External links RouteYou.com: Afon Melynllyn
Rivers of C ...

(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 P ...

(L) ***

Afon Eigiau Afon Eigiau is a small river in the Carneddau mountains in Snowdonia, in north-west Wales, which flows down Cwm Eigiau and into Llyn Eigiau. It is fed by smaller streams which flow down the slopes of neighbouring Foel Grach Foel Grach i ...

(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 Con ...

(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 upstrea ...

(R) ** Nant y Goron (R) **

Afon Llugwy River Llugwy (Welsh: ''Afon Llugwy'') is a tributary of the River Conwy, and has its source at Ffynnon Llugwy, a lake in the Carneddau range of mountains in Snowdonia in north-west Wales. Location and catchment area The average annual ...

(L) ***

Nantygwryd Dyffryn Mymbyr is a valley in Snowdonia, in north-west Wales, approximately in length, and leading up from Capel Curig to the Pen-y-Gwryd hotel. The river Nantygwryd, originally called Y Mymbyr in Llywelyn the Great's charter of 1198, starts ...

(R) **

Afon Lledr The ( en, River Lledr, italic=yes) is a river in north-west Wales and the second major tributary of the River Conwy. It is about 10 miles or 16 km long, and flows in a generally easterly direction. The has its source on the eastern slo ...

(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 ups ...

(R) ***

Afon Ystumiau 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 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, past the Pandy Falls and the Machno Falls. It has its source in the slopes at ...

(L) *** Afon Glasgwm (L) **

Afon Iwrch The Afon Iwrch is a river near Llanrhaeadr-ym-Mochnant in Clwyd, Wales. It is a tributary of the River Tanat and is in length. Its headwaters lie on the eastern slopes of Cadair Berwyn, the highest peak of the Berwyn range, and the river flo ...

(R) ** Afon Eidda (L) ** Merddwr (R) **

Afon Caletwr 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 Serw 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)

Simple coastal catchments

* Afon Gyrach *

** Afon Glan-sais (L) ** Afon Maes-y-bryn (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 watershed ...

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, flowin ...

(Rs) ** Afon Rhaeadr Fawr (Ls) ***

Afon Rhaeadr Bach 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) ****

Afon Gam 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 Goch 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 ...

(Rs)

Ogwen catchment

Afon Ogwen ˈ The Afon Ogwen (; ; Welsh, meaning River Ogwen in English) is a river in north-west Wales draining from some of the greatest peaks in Snowdonia before discharging to the sea on the eastern side of Bangor, Gwynedd. Etymology Although the spok ...

** Afon Caseg (R) ***

(L) *** Afon Denau (flows into

Llyn Ogwen Llyn Ogwen (; ) is a ribbon lake in north-west Wales. It lies alongside the A5 road A5 Road may refer to: ;Africa * A5 highway (Nigeria), a road connecting Lagos and Ibadan * A5 road (Zimbabwe), a road connecting Harare and Francistown ;Ame ...

) **** Nant Gwern y Gof (L) ***

Afon Lloer Afon Lloer is a small river in Snowdonia in north-west Wales. It is the outflow from Ffynnon Lloer, a lake in the Carneddau mountains, and it flows into Llyn Ogwen Llyn Ogwen (; ) is a ribbon lake in north-west Wales. It lies alongside th ...

(flows into

)

Cegin catchment

River Cegin 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 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 Local government in Wales, principal area known as the Isle of Anglesey, that includes Holy Island, Anglesey, Holy Island across the narrow Cymyran Strai ...
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 Thomas Te ...

/ Porthaethwy

Minor coastal catchments

Afon Cadnant The Afon Cadnant ( en, River Cadnant) is a small river on Anglesey, North Wales, which drains to the Menai Strait about 1 km north-east of the Menai Suspension Bridge. The river drains a largely agricultural area from Llandegfan to Llans ...

(River Cadnant) * Nant Meigan * Lleiniog *

Afon Nodwydd 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 ups ...

Afon y Marchogion 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 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 ups ...

* Nant Perfedd *

(Dulas) * Nant y Beddyw *

Afon Bryn Gwyn 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 ups ...

(Amlwch) *

Afon Wygyr 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 ...

* Gwter Fudr *

Afon Alaw The Afon Alaw ( en, River Alaw) is a river on Anglesey (Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * ...

(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 (L)

Ffraw catchment

Afon Ffraw The Afon Ffraw is a short river on the Isle of Anglesey, Wales. It arises at Llyn Coron and flows southwest for two miles along the northwestern margin of Twyn Aberffraw ('Aberffraw dunes') via the village of Aberffraw to Aberffraw Bay on the islan ...

** Afon Frechwen (L) **

Afon Gwna The Afon Ffraw is a short river on the Isle of Anglesey, Wales. It arises at Llyn Coron and flows southwest for two miles along the northwestern margin of Twyn Aberffraw ('Aberffraw dunes') via the village of Aberffraw to Aberffraw Bay on the islan ...

(flows into

Llyn Coron The Afon Ffraw is a short river on the Isle of Anglesey, Wales. It arises at Llyn Coron and flows southwest for two miles along the northwestern margin of Twyn Aberffraw ('Aberffraw dunes') via the village of Aberffraw Aberffraw is a village a ...

)

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 t ...

(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 Afon Braint ( en, River Braint) is a small tidal river on Anglesey, North Wales. There is a series of stepping stones near the village of Dwyran, and a Grade II bridge near Penmynydd. Until recently, there was an electoral ward named after the r ...

(River Braint, Dwyran) **

Afon Rhyd y Valley 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)

Braint (ii) catchment

(LlanfairPG) ** Afon Rhyd Eilian (L) ''Note "Afon Menai", known as the "

Menai Strait The Menai Strait ( cy, Afon Menai, the "river Menai") is a narrow stretch of shallow tidal water about long, which separates the island of Anglesey from the mainland of Wales. It varies in width from from Fort Belan to Abermenai Point to from ...

" in English, is not technically a river, despite its Welsh name.''.

Mainland rivers flowing into the
Menai Strait The Menai Strait ( cy, Afon Menai, the "river Menai") is a narrow stretch of shallow tidal water about long, which separates the island of Anglesey from the mainland of Wales. It varies in width from from Fort Belan to Abermenai Point to from ...
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, Llithfaen , and Clynnog Faw ...

''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. ...

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 the ...

(River Seiont) (known as Afon Rhythallt above Pont-Rhythallt) **

Afon Nant Peris 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 Peris) ***

Afon Arddu 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)

Gwyrfai catchment

Afon Gwyrfai The Afon Gwyrfai is a short river in Gwynedd, Wales. For half of its length it flows through Snowdonia National Park. Exiting Llyn y Gader it flows north through the small village of Rhyd-ddu to enter the southeastern end of Llyn Cwellyn. Downs ...

Afon Carrog 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 Rhŷd 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)

Simple coastal catchments

Afon Llifon 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 Llyfni, Lleyn * Afon Desach *

Afon Hen 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 ...

Nant Gwrtheyrn Nant Gwrtheyrn is a Welsh Language and Heritage Centre, located near the village of Llithfaen on the northern coast of the Llŷn Peninsula, Gwynedd, in northwest Wales. It is sometimes referred to as 'the Nant' and is named after the valley whe ...

* 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

St. David's Head ST, St, or St. may refer to: Arts and entertainment * Stanza, in poetry * Suicidal Tendencies, an American heavy metal/hardcore punk band * Star Trek, a science-fiction media franchise * Summa Theologica, a compendium of Catholic philosophy ...

'' * Afon Saint

Daron catchment

* Afon Daron **

Afon Cyllyfelin 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)

Soch catchment

Afon Soch The Afon Soch is a short river on the Llŷn peninsula, Gwynedd, Wales. It arises to the north of the village of Sarn Meyllteyrn, through which it then flows, turning southeast towards Botwnnog. Beyond Botwnnog it is joined by its main left-bank tr ...

** Afon Horon (L)

Rhyd-hir catchment etc

* Afon Rhyd-hir **

Afon Penrhos 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 Erch The Afon Erch is a short river on the Llŷn peninsula, Gwynedd, Wales. It arises on the slopes of Bwlch Mawr, flowing south and southwest towards the hamlet of Llwyndyrys where it turns abruptly eastwards and curves around to the south, passing ...

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 the ...

** Afon Dwyfach (R) ** Afon Henwy (L)

Glaslyn catchment

Afon Glaslyn The Afon Glaslyn (English, ''River Glaslyn'') is a river in Gwynedd, north-west Wales. While not of great significance in terms of its length (about ), it is one of Gwynedd's primary rivers, and has greatly influenced the landscape in which it ...

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 Nantmor is a hamlet which lies about 1½ miles to the south of the village of Beddgelert in Gwynedd, Wales. The current spelling of the name Nantmor is more modernmost old documentfrom the 16th to the 18th century record the name as Nanmor. It ...

(L) ** Afon Colwyn (R) ** Afon Llynedno (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 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 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 o ...

(L) **

Afon Cynfal 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 Teigl (L) **

Afon Bowydd 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 Tafarn Helyg

Artro catchment

* Afon Artro **

Afon Cwmnantcol The River Cwmnantcol (''Afon Cwmnantcol'' in Welsh) is a river in North Wales. It is about long and has its source at the head of Cwm Nantcol below Rhinog Fawr and Y Llethr. It flows north-west from its source and joins the Afon Artro at Pen ...

(L)

Ysgethin catchment

Afon Ysgethin The Afon Ysgethin is a short river in Gwynedd, Wales. Flowing entirely within Snowdonia National Park it rises beneath the peaks of Y Llethr and Diffwys within the Rhinogydd, Rhinogs mountain range and runs in a generally ESE direction towards C ...

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 tribut ...

** Afon Dwynant (R) ** Afon Gwynant (L) **

Afon Cwm-llechen 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 Cwm-mynach 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 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, i ...

(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 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 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 The River Dysynni ( cy, Afon Dysynni) is a river in mid Wales. Its source is the Tal-y-llyn Lake ( cy, Llyn Mwyngil) just south of the Cadair Idris massif and its mouth is in the Cardigan Bay area of the Irish Sea to the north of Tywyn. It measure ...

(R) **

Afon Fathew The Afon Fathew ( en, River Mathew/Fathew) is a river in Gwynedd, north-west Wales. The river is downstream from the Dolgoch Falls which is a popular nature site, and is followed for much of its course by the Talyllyn Railway. Name The basi ...

(L) **

Afon Cadair 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 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 Democratic Youth Federation of India (DYFI ...

(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 upstrea ...

(R) **

Afon Einion 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 Llyfnant The River Llyfnant ( cy, Afon Llyfnant) is a short river in Ceredigion, on the west coast of Wales. The river rises in the mountains south of Machynlleth, reaches the hill walk of Uwch Garreg and then plunges over a series of waterfalls known ...

(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 Dyfi ( cy, Afon Dyfi ...

(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 Du ...

(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 Ri ...

(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 upstrea ...

(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 Reservoir, 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 **

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

Cledan catchment

* Afon Cledan

Arth catchment

* River Arth

Aeron catchment

* River Aeron, 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) ***

(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, Teifi, 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

* 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, Pembrokeshire, River Alun * River Solva (Afon Solfach) * Brandy Brook

Cleddau catchment

* Daugleddau (estuary is Daugleddyf or Milford Haven Waterway, 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''

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, Pembrokeshire, Afon Marlais (R)

Towy catchment

* River Tywi, Afon Tywi (River Towy) ** Afon Gwili (R) ** Afon Annell (R) ** River Cothi (R) (Afon Cothi) *** Afon Gorlech (R) *** Afon Twrch, Carmarthenshire, Afon Twrch (R) *** Afon Marlais, Carmarthenshire, Afon Marlais (R) **

(R) ** Afon Cennen (L) ** Afon Sawdde (L) ** Afon Bran (L) *** Afon Ydw (R) ** Afon Dulais (R) ** Afon Brân (L) ***Afon Brân, Cynnant Fawr (Rs) ****Afon Brân, Cynnant Fach (L) ***Afon Brân, Afon Lwynor (Ls) *** Afon Crychan (L) *** Afon Gwydderig (L) ** Afon Gwenlais (R) ** Gwenffrwd, Towy, Gwenffrwd (R) *** Nant Melyn, Towy, 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 (Loughor), Afon Lliw (L) *** Afon Llan (L) ** Afon Gwili (Loughor), 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)

Neath catchment

* River Neath ** River Clydach, Monmouthshire, River Clydach (R) ** River Dulais (R) ** Melin Cwrt Brook (L) ** Clydach Brook (L) ** Nedd Fechan (Rs) *** Afon Pyrddin (R) ** Afon Mellte (Ls) *** Sychryd(L) *** Afon Hepste (L) *** Afon Llia (Rs) *** Afon Dringarth (Ls)

Afan catchment

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

Kenfig catchment

* River Kenfig (Afon Cynffig)

Ogmore catchment

* River Ogmore (Afon Ogwr) ** River Ewenny (L) *** Afon Alun (Vale of Glamorgan), Afon Alun (L) *** Afon Ewenny Fach (L) *** Nant Canna (L) *** Nant Crymlyn (R) ** River Llynfi (R) *** Nant y Gadlys (R) *** Nant Cwm-du (L) ** Afon Garw (R) ** Afon Ogwr Fawr (Rs) ** Afon Ogwr Fach (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 ** Kenson River (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 (L) ** Bullcroft Brook (Ls) ** Wrinstone Brook (Rs)

Taff catchment

(Afon Taf) ** River Ely (Afon Elái) (R) *** Afon Clun (L) (Nant Myddlyn in upper reaches) ** River Rhondda (R) (Afon Rhondda) *** Rhondda Fawr (Ls) *** Rhondda Fach (Rs) *** River Ritec (Afon Ritec) ** Nant Clydach (R) ** River Cynon (R) (Afon Cynon) *** Aman River *** Afon Dar *** Afon Pennar ** Bargoed Taf (L) ** River Taff#Taf Fechan, Nant Morlais ** River Taff#Taf Fechan, Taf Fechan (Ls) ** Nant Ffrwd (Rs)

Rhymney catchment

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

Usk catchment

* River Usk (Afon Wysg) ** Ebbw River (R) (Afon Ebwy) *** Sirhowy River (R) *** Ebbw River, River Ebbw Fach (L) ** Afon Llwyd (R) ** Sôr Brook (R) ** Olway Brook (L) ** Berthin Brook (R) ** Afon Gafenni (L) (River Gavenny) ***River Gavenny#Afon Cibi, Afon Cibi (R) ** River Clydach, Monmouthshire, River Clydach (R) ** Grwyne Fawr (L) *** Grwyne Fechan (R) ** Rhiangoll (L) ** Nant Cleisfer (R) ** Afon Crawnon (R) ** Caerfanell (R) ** Nant Menasgin (R) ** Afon Cynrig (R) ** River Honddu (Powys), 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

(Afon Gwy) ** River Trothy (R) ** River Monnow (Afon Mynwy) (R) *** River Dore (L) **** Dulas Brook (R) **** Worm Brook (L) *** River Honddu (Monmouthshire), River Honddu (R) *** Olchon Brook (R) *** Escley Brook (L) ** River Lugg (L) (Afon Llugwy) *** River Frome, Herefordshire, River Frome (L) *** River Kenwater *** River Arrow (Wales), River Arrow (R) **** Cynon Brook ***** Gilwern Brook **** Gladestry Brook ** Dulas Brook (R) ** Afon Llynfi (Wye), Afon Llynfi (R) *** Afon Llynfi (Wye), River Ennig (R) *** Afon Llynfi (Wye), Dulas (L) **** Triffrwd (L) ** Bachawy (L) ** Afon Edw (L) ** Duhonw (R) ** Afon Irfon (R) *** Afon Chwerfri (L) *** Dulas, Irfon, Dulas (L) *** Afon Cammarch (L) ***

(R) *** Afon Gwesyn (L) ** Dulas Brook (L) ** River Ithon (L) (Afon Ieithon) *** Dulas, Ithon, Dulas (R) *** Clywedog Brook (R) *** Afon Aran (L) *** Camddwr (L) ** Afon Elan (R) *** Afon Claerwen (R) **** Rhiwnant (R) **** Afon Arban (R) **** Afon Claerddu (R) *** Afon Gwngu (R) ** River Marteg, 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. *

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_ ...

(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 (river), Cynllaith (L) (part forms the border between Wales and England) ***** Afon Ogau **** Afon Iwrch (L) **** River Rhaeadr, Afon Rhaeadr (L) **** Afon Eirth (L) *** River Cain, Afon Cain (L) **** Nant Fyllon (Ls) **** Nant Alan (Rs) *** Afon Banwy (R) (a.k.a. Afon Einion) ****

(R) ****

(R) **** Afon Twrch (L) ** 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 (river), 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) *** Afon Cerist (R) **** Colwyn Brook (L) ** Nant Feinion (R) ** Wigdwr Brook (L) ** Afon Clywedog (L) *** Afon Biga (R) (flows into Clywedog Reservoir) *** Afon Llwyd (Clywedog), Afon Llwyd (R) (flows into Clywedog Reservoir) ** Afon Dulas, Llanidloes, 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.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, 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 Lists of rivers of the United Kingdom, Wales Rivers of Wales, Lists of landforms of Wales, Rivers of Wales Lists of rivers by country, Wales

Mainland rivers flowing into Liverpool Bay

Dee catchment

Clwyd catchment

Conwy catchment

Simple coastal catchments

Aber catchment

Ogwen catchment

Cegin catchment

Adda catchment

Isle of Anglesey Anglesey (; cy, (Ynys) Môn ) is an island off the north-west coast of Wales. It forms a Local government in Wales, principal area known as the Isle of Anglesey, that includes Holy Island, Anglesey, Holy Island across the narrow Cymyran Strai ... 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 Local government in Wales, principal area known as the Isle of Anglesey, that includes Holy Island, Anglesey, Holy Island across the narrow Cymyran Strai ...
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 ...