The River Wnion is a river in the southeast of

Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, and ...

, Wales. It begins high on the slopes of Aran Benllyn about five miles south of Lanuwchllyn and flows south-west into the

River 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 ...

near

Cymer Abbey Cymer Abbey (Welsh: ''Abaty Cymer'') is a ruined Cistercian abbey near the village of Llanelltyd, just north of Dolgellau, Gwynedd, in north-west Wales, United Kingdom. History It was founded in 1189 and dedicated to the Virgin Mary under the ...

. It flows past several villages, including and Bontnewydd, where a bridge crosses over the river that dates from the 18th century. It then flows to

Dolgellau Dolgellau () is a town and community in Gwynedd, north-west Wales, lying on the River Wnion, a tributary of the River Mawddach. It was the traditional county town of the historic county of Merionethshire ( cy, Meirionnydd, Sir Feirionnydd) u ...

where another locally famous bridge, known as "Y Bont Fawr". Its total length is approximately 12 miles. The river may get its name from 'White' which turned from "gwyn" (white) into "gwn" (gun); indeed, there is a place called 'Pennar(th) Gwynion' in the vicinity, near Hengwrt.

References

Wnion Merionethshire {{Wales-river-stub