The Afon Deri (sometimes known as the Afon Corris[1]) is a river in Mid Wales. It flows from the eastern flank of Mynydd Ty-Glas down to Corris, where it joins the Afon Dulas that flows south to the Afon Dyfi.[2]

Afon Deri
The lower reaches of the Afon Deri around 1885
Location
Country	Wales
Physical characteristics
Source	Mynydd Ty-glas
• elevation	1,500 ft (460 m)
Mouth
• location	Corris
• coordinates	52°39′12″N 3°50′20″W
• elevation	280 ft (85 m)

The river passes through the village of Corris Uchaf and its lower reaches pass through the richest area of slate quarrying in Mid Wales. The Braichgoch, Abercorris and Abercwmeiddaw quarries are to be found beside the Afon Deri.[3]

References