The waterfalls along the rivers that run south through Fforest Fawr and join at Pontneddfachan are stunning and the setting among steep, wooded gorges is fantastic walking country. This area is a great contrast to the uplands of the Brecon Beacons National Park.
There is a walk called the 4 Waterfalls Walk which is signposted by the park authority. They recommend starting at the village of Penderyn which makes access easy to the waterfalls and is a good route if you don’t have time for a full day of exploring the rivers.
A good circular route that takes in all four rivers and the waterfalls is to start at Pontneddfechan, parking at Craig y Dinas, walk back through the village and follow the path up the side of the Afon Nedd behind the pub.
After about 4 km the path can be followed across to the car park near a large cave mouth that swallows the Afon Mellte and is popular with cavers. This is just south of the village of Ystradfellte.
From here there are well marked paths leading south to the Four Waterfalls Walk. After visiting whichever of the waterfalls you have the time and energy for then follow the signs to the waterfall called Sgwd yr Eira. This is a hanging waterfall with a path running behind so you can cross the Afon Hepste and follow the paths south back to the car park at Craig y Dinas.
This can also be done by starting at the cavers car park near Ystradfellte and stopping at the pub in Pontneddfechan for lunch!