The River Dulas (Welsh: Afon Dulas) is a tributary of the River Teifi and has its source near the village of Llangybi, Ceredigion, Wales. Its confluence with the Teifi is near Lampeter.[1]
In June 2017, effluent from an anaerobic digestion plant in Lampeter was discharged into the Dulas. This caused a pollution incident that was investigated by Natural Resources Wales.[1]