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Afon Cefni is one of the major
river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...
s on the island of
Anglesey Anglesey ( ; ) is an island off the north-west coast of Wales. It forms the bulk of the Principal areas of Wales, county known as the Isle of Anglesey, which also includes Holy Island, Anglesey, Holy Island () and some islets and Skerry, sker ...
,
Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
. It is long. Its source is near to the village of
Capel Coch Capel Coch is a small village in Anglesey, in north-west Wales. Much of the village overlooks Cors Erddreiniog National Nature Reserve. It is in the community of Llanddyfnan Llanddyfnan is a village and community (Wales), community in Angl ...
, before flowing through
Bodffordd Bodffordd () is a village and community in central Anglesey, Wales. As of the 2011 census, the community's population was 960. The community includes the hamlets of Trefor, Heneglwys and Bodwrog. Description and history Bodffordd is located ...
and into
Llyn Cefni 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 ...
in the centre of the island. It continues to run south through the county town of
Llangefni ; ) is the county town of Anglesey in Wales. At the 2011 census, Llangefni's population was 5,116, making it the second-largest town in the county and the largest on the island. The community includes the village of Rhosmeirch. Location The ...
. Just north of the A55 the river turns and flows south-west. It passes through the flatlands of the Malltraeth Marshes, where the river course was altered in 1824, creating a canal-like straight stretch. This part of the river and the surrounding marshes, part of which is a RSPB reserve, are frequented by a variety of wetland birds which in their turn are preyed on by falcons, hawks and harriers. A cycle trail follows the straightened course of the river as it flows through the marshes. Finally it flows under a bridge carrying the North Wales Coast Railway Line at Malltraeth Sands in the south-west of the island and into the
Irish Sea The Irish Sea is a body of water that separates the islands of Ireland and Great Britain. It is linked to the Celtic Sea in the south by St George's Channel and to the Inner Seas off the West Coast of Scotland in the north by the North Ch ...
. The viaduct is described as "noble" and has nineteen arches. An embankment carries the A4080 across the estuary at the village of Malltraeth, half a mile below the railway bridge. Another RSPB reserve is to be found in the estuary here, Newbourough Warren. Malltraeth Pool at the north end of the estuary is a place visited by many waterbirds during their spring and autumn migrations, and other wildfowl and waders are to be seen on the estuary all winter. Newborough Forest on the southern shore is used by large numbers of
raven A raven is any of several large-bodied passerine bird species in the genus '' Corvus''. These species do not form a single taxonomic group within the genus. There is no consistent distinction between crows and ravens; the two names are assigne ...
s as a winter roost, and a peninsula and a rocky islet in the estuary are a breeding ground for shags and
cormorant 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 International Ornithologists' Union (IOU) ado ...
s. Migration of fish and eels is effectively blocked by the dam at the Cefni water treatment works, holding back the Cefni reservoir. Attempts to prompt the installation of a fish pass have proven unsuccessful to date. There was a ship named after the river built in Glasgow in 1890 by a company based in
Menai Bridge Menai Bridge (; 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 Telford, j ...
. There is currently a tug named ''Afon Cefni'', operated by Holyhead Towing. It can be tracked on Ship AIS websites.


References

{{Authority control Rivers of Anglesey