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Afon Merddwr
Merddwr river at Pentrefoelas.jpg
Afon Merddwr at Pentrefoelas
Afon Merddwr is located in Conwy
Afon Merddwr
Location of the mouth within Conwy
Native name Afon Merddwr
Country Wales
Counties Gwynedd
Physical characteristics
Main source Mwdwl-eithin
River mouth River Conwy
Length 16 km (9.9 mi)

Afon Merddwr is a river in the south of the county of Conwy, Wales. It is a tributary of the River Conwy and joins it near Pentrefoelas. It is about 10 km long. "Merddwr" is Welsh for backwater or stagnant water, suggesting that it was named for its current or water quality.

Y Merddwr - - 769744
Merddwr flowing west at Pentrefoelas
Afon Merddwr - - 785008
Afon Merddwr

Course of the river

The source of the river is on the southern slopes of Mwdwl-eithin (532 m), the highest hill in Mynydd Hiraethog (the Denbigh Moors). Its name for the first part of its course is Afon Llaethog ("Milky River"). It flows south before turning west near the small village of Glasfryn.

Several streams flow down from the hills into the river as it flows through wetland and marshes to its confluence near Rhydlydan with the Afon Nug, a small stream that flows from the hills above Pentrefoelas. The marshes are a Site of Special Scientific Interest known as Corsydd Nug a Merddwr ("Nug and Merddwr Marshes").

The river flows beside the A5 road, under a bridge for the B5113 near Pentrefoelas, and on for another 2 km to the River Conwy north of Ysbyty Ifan.

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