The River Ffyddion is a tributary of the River Clwyd in North Wales. It is this river that forms Dyserth Waterfall.[1]

The river flows from the main body of the River Clwyd and then branches off North and goes towards Prestatyn. As this river forms a waterfall and goes through the village of Dyserth, it can be prone to flooding. An example was back in 2000.[2]

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