The Afon Twymyn (English: River Twymyn) is a river in Powys, Mid Wales.
From its source close to Dylife and head of the Pennant Valley, the river flows through Llanbrynmair before joining the River Dyfi upstream of Cemmaes Road.
See also
52°38′N 3°44′W / 52.633°N 3.733°W
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