Its source lies in the hills of southernmost Flintshire to the east of Rhydtalog village.

It flows in a roughly north-easterly direction before turning south-east through the villages of Llanfynydd and Ffrith where the Nant-y-Ffrith stream flows into it.

It then heads north-east again through a wooded valley before joining the River Alyn at Cefn-y-bedd.

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