From the village of Gellilydan we walk across grazing fields and through woodland to reach the Ceunant Llenyrch National Nature Reserve. Here the Afon Prysor flows in a deep, shady gorge through Atlantic oak woodlands which are rich in wildlife, including rare bats and lichens. We have views of the Rhaeadr Du waterfall before following a path, which can be rough in places, along the route of the stream. Branching off away from the river, we cross fields again and then continue through rough pastures and back to Gellilydan.
(There are some slight ascents and descents on the route. We will for be stopping for a morning refreshment break and picnic lunch.)