| River Twymyn (Afon Twymyn) | |
| River | |
|
River Twymyn at Cringoed, looking downstream
|
|
| Country | Wales |
|---|---|
| Region | Powys |
| Source | Dylife |
| Mouth | |
| - location | River Dyfi, Cemmaes Road |
The River Twymyn (Afon Twymyn in Welsh) is a river in Powys, Mid Wales.
From its source at the 40-metre high Ffrwd Fawr waterfall and head of the Pennant Valley near Dylife the river flows through Llanbrynmair before joining the River Dyfi upstream of Cemmaes Road.