The River Towy ( cy, Afon Tywi, ) is one of the longest rivers flowing entirely within

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 ...

. Its total length is . It is noted for its sea trout and

salmon Salmon () is the common name for several commercially important species of euryhaline ray-finned fish from the family Salmonidae, which are native to tributaries of the North Atlantic (genus ''Salmo'') and North Pacific (genus '' Oncorhy ...

fishing.

Route

The Towy rises within of the source of the

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 ...

on the lower slopes of Crug Gynan in the Cambrian Mountains. Flowing through the steep hills of the Tywi Forest, it forms the boundary between

Ceredigion Ceredigion ( , , ) is a county in the west of Wales, corresponding to the historic county of Cardiganshire. During the second half of the first millennium Ceredigion was a minor kingdom. It has been administered as a county since 1282. Cer ...

and

Powys Powys (; ) is a county and preserved county in Wales. It is named after the Kingdom of Powys which was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. Geog ...

. The river flows generally south-westwards through

Carmarthenshire Carmarthenshire ( cy, Sir Gaerfyrddin; or informally ') is a county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. The county is known as ...

, passing through the towns of

Llandovery Llandovery (; cy, Llanymddyfri ) is a market town and community in Carmarthenshire, Wales. It lies on the River Tywi and at the junction of the A40 and A483 roads, about north-east of Carmarthen, north of Swansea and west of Brecon. Hi ...

and

Llandeilo Llandeilo () is a town and community in Carmarthenshire, Wales, situated at the crossing of the River Towy by the A483 on a 19th-century stone bridge. Its population was 1,795 at the 2011 Census. It is adjacent to the westernmost point of the ...

. Its total length is . with numerous tributaries that include the Cothi, Gwili, Brân, and Doethie."First Water Resources Survey : Report", South West Wales River Authority (1970), pg. 41; Table 1. In

Carmarthen Carmarthen (, RP: ; cy, Caerfyrddin , "Merlin's fort" or "Sea-town fort") is the county town of Carmarthenshire and a community in Wales, lying on the River Towy. north of its estuary in Carmarthen Bay. The population was 14,185 in 2011, ...

, it is joined by a substantial

tributary 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 drai ...

, the

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 ...

, at

Abergwili Abergwili () is a village and community in Carmarthenshire, Wales, near the confluence of the rivers Towy and Gwili, close to the town of Carmarthen. It is also an electoral ward. The community includes the settlements of Peniel, Llanfihangel-u ...

. The

estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environm ...

meets

Carmarthen Bay Carmarthen Bay ( cy, Bae Caerfyrddin) is an inlet of the South Wales coast, including notable beaches such as Pendine Sands and Cefn Sidan sands. Carmarthen Bay is partially within the Pembrokeshire Coast National Park. The Joint Nature Conserva ...

east of the

Pendine Sands Pendine Sands ( cy, Traeth Pentywyn) is a beach on the shores of Carmarthen Bay on the south coast of Wales. It stretches west to east from Gilman Point to Laugharne Sands. The village of Pendine ( cy, Pentywyn, link=no) is close to the west ...

along with the

River Taf 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 ...

and both branches of the

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) ...

. The estuary was guarded by

Llansteffan Castle Llansteffan Castle ( cy, Castell Llansteffan) is a privately owned castle in Llansteffan, Carmarthenshire, Wales, overlooking the River Tywi estuary in Carmarthen Bay. Iron Age The castle sits on a much older Iron Age promontory fort, p ...

, a 12th-century

Norman Norman or Normans may refer to: Ethnic and cultural identity * The Normans, a people partly descended from Norse Vikings who settled in the territory of Normandy in France in the 10th and 11th centuries ** People or things connected with the Norm ...

castle.

Damming of the Towy

About from its source, the swift flow of the Towy is interrupted by the

Llyn Brianne Llyn Brianne is a man-made lake or Reservoir (water), reservoir in the headwaters of the River Tywi in Wales. Construction The reservoir was constructed by George Wimpey, Wimpey Construction in the late 1960s and early 1970s in order to regul ...

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

, created in 1972 by

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use ...

ming a section of the river to store winter rain for release into the river during dry periods. The reservoir supports the new abstraction at

Nantgaredig Nantgaredig is a village in Carmarthenshire, Wales. It is about east of the county town of Carmarthen on the A40 in the parish of Llanegwad. the Population was around 524 as of the 2011 census. Notable people The village is most notable for b ...

which supplies a large swathe of south-east

with

drinking water Drinking water is water that is used in drink or food preparation; potable water is water that is safe to be used as drinking water. The amount of drinking water required to maintain good health varies, and depends on physical activity level, a ...

. The flow in the River Towy would have been unable to sustain such an abstraction were it not for the release of water from the upland reservoir.

Ecology

Fish

The Towy is a national draw for big sea trout (local name ''sewin''), the seagoing form of the brown trout, ''

Salmo trutta The brown trout (''Salmo trutta'') is a European species of salmonid fish that has been widely introduced into suitable environments globally. It includes purely freshwater populations, referred to as the riverine ecotype, ''Salmo trutta'' morph ...

''. These fish enter the river each spring and early summer to breed in the tributaries. The river is thought to produce more double-figure (10 lbs plus, or about 5 kg or more) sea trout than any other in Britain. Anglers and estuary netsmen have taken these fish to over in weight. In summer and autumn there is also a substantial run of Atlantic salmon ('' Salmo salar''). In May the Towy has a run of the rare and protected

twaite shad The twait shad or twaite shad (''Alosa fallax'') is a species of fish in the family Clupeidae. It is found in the eastern Atlantic Ocean and the Mediterranean Sea and is an anadromous fish which lives in the sea but migrates into fresh water to s ...

and

allis shad The allis shad (''Alosa alosa'') is a widespread Northeast Atlantic species of fish in the herring family, Clupeidae. It is an anadromous fish which migrates into fresh water to spawn. It is found in the eastern Atlantic Ocean, the western Bal ...

. The Towy also contains brown trout, eels, pike, and a variety of small fish species, and is home to brook lampreys, river lampreys and sea lampreys. The Towy has the distinction of having accidentally produced by far the biggest fish ever taken on rod and line in fresh water in Britain. This was a sturgeon (''Acipwienser sturio'') weighing 388 lb (176 kg) and in length which was caught in the river near Nantgaredig by Alec Allen on 28 July 1932.

Mammals

The Towy has a thriving population of

otters Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic, or marine, with diets based on fish and invertebrates. Lutrinae is a branch of the Mustelidae family, which also includes weas ...

, as well as many commoner mammal species.

Grey seal The grey seal (''Halichoerus grypus'') is found on both shores of the North Atlantic Ocean. In Latin Halichoerus grypus means "hook-nosed sea pig". It is a large seal of the family Phocidae, which are commonly referred to as "true seals" or " ...

s are common in the lower reaches and sometimes penetrate several miles up river in pursuit of sea trout and salmon.

Birds

The Towy and surrounding valley (Dyffryn Tywi) are home to a very large variety of water and wetland birds. Among the more distinctive species found along the river are sand martins,

common sandpiper The common sandpiper (''Actitis hypoleucos'') is a small Palearctic wader. This bird and its American sister species, the spotted sandpiper (''A. macularia''), make up the genus ''Actitis''. They are parapatric and replace each other geographic ...

little ringed plover The little ringed plover (''Charadrius dubius'') is a small plover. The genus name ''Charadrius'' is a Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate. It derives from Ancient Greek ''kharadrios'' a bird found in river ...

dippers Dippers are members of the genus ''Cinclus'' in the bird family Cinclidae, so-called because of their bobbing or dipping movements. They are unique among passerines for their ability to dive and swim underwater. Taxonomy The genus ''Cinclus'' ...

kingfishers Kingfishers are a family, the Alcedinidae, of small to medium-sized, brightly colored birds in the order Coraciiformes. They have a cosmopolitan distribution, with most species found in the tropical regions of Africa, Asia, and Oceania, ...

and

grey wagtail The grey wagtail (''Motacilla cinerea'') is a member of the wagtail family, Motacillidae, measuring around 18–19 cm overall length. The species looks somewhat similar to the yellow wagtail but has the yellow on its underside restricted to ...

Red kite The red kite (''Milvus milvus'') is a medium-large bird of prey in the family Accipitridae, which also includes many other diurnal raptors such as eagles, buzzards, and harriers. The species currently breeds in the Western Palearctic region o ...

s and

buzzards Buzzard is the common name of several species of birds of prey. ''Buteo'' species * Archer's buzzard (''Buteo archeri'') * Augur buzzard (''Buteo augur'') * Broad-winged hawk (''Buteo platypterus'') * Common buzzard (''Buteo buteo'') * Eastern ...

are numerous.

Goosander The common merganser (North American) or goosander (Eurasian) (''Mergus merganser'') is a large seaduck of rivers and lakes in forested areas of Europe, Asia, and North America. The common merganser eats mainly fish. It nests in holes in trees. ...

s and

cormorants Phalacrocoracidae is a family of approximately 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the IOC adopted a consensus taxonomy of seven gen ...

prey on sea trout and salmon.

Plants

The prevalence of oxbow lakes in the Towy valley provides some spectacular shows through the year. In summer at Bishop's Pond in Abergwili (an oxbow lake formed when the river flooded in 1802) there is a spectacular show of yellow

water lilies ''Water Lilies'' (or ''Nymphéas'', ) is a series of approximately 250 oil paintings by French Impressionist Claude Monet (1840–1926). The paintings depict his flower garden at his home in Giverny, and were the main focus of his artisti ...

on the pond when the water level drops and

reed sweet-grass ''Glyceria maxima'' (syn. ''G. aquatica'' (L.) Wahlenb.; ''G. spectabilis'' Mert. & W.D.J. Koch; ''Molinia maxima'' Hartm.; ''Poa aquatica'' L.), commonly known as great manna grass, reed mannagrass, reed sweet-grass, and greater sweet-grass is a ...

fringes the edges – a species also found nearby in the Teifi valley further west in Pembrokeshire, in

Gower Gower ( cy, Gŵyr) or the Gower Peninsula () in southwest Wales, projects towards the Bristol Channel. It is the most westerly part of the historic county of Glamorgan. In 1956, the majority of Gower became the first area in the United Kingdom ...

, in Powys (especially along the

Montgomery Canal The Montgomery Canal ( cy, Camlas Trefaldwyn), known colloquially as "The Monty", is a partially restored canal in eastern Powys and northwest Shropshire. The canal runs from the Llangollen Canal at Frankton Junction to Newtown via Llanym ...

), on

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 ...

and in several sites along the North Wales coast.

Glanrhyd Bridge disaster

On 19 October 1987, three days after the Great Storm of 1987, four people were killed when a train plunged off Glanrhyd Bridge near Llangadog into the flooded river.

Notes and references

;Notes ;References

External links

Southwest Wales and its Nature Reserves

CCW - Protecting Allis Shad