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The River Dovey (Afon Dyfi) is a river in Mid Wales. The Dovey estuary forms the border between the counties of Gwynedd and Ceredigion.
The Dovey rises in the small lake Creiglyn Dyfi at about 1,900 feet above sea level, below Aran Fawddwy, flowing south to Dinas Mawddwy and Cemmaes Road, then south west past Machynlleth to Cardigan Bay at Aberdyfi. It shares its watershed with the River Severn and the River Dee before flowing generally south-westwards down to a wide estuary. The only large town on its route is Machynlleth.
Because of its origins high in the Cambrian Mountains and its relatively short length, it is prone to flooding and some roads in the lower catchment can become impassable during very wet weather. It has been a relatively pristine river with few polluting inputs and is notable for its Salmon and Sea Trout.

The Afon Ddu (Black River) is a short river (8 km) in Ceredigian. It rises on the slopes of Moel-y-Llyn and joins the Afon Dyfi near Glandyfi.