[1] After flowing east through Llanfyllin, where it is joined by the small River Abel, it continues eastwards alongside the A490 highway.
It then turns north-east to pass through Llanfechain and is joined by the Nant Llys before finally flowing east again.
[2] It is fed by the Brogan,[3] before joining the Vyrnwy near Llansantffraid-ym-Mechain.
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