Sgwd Gwladys or Lady Fall is in the Vale of Neath and can be accessed from Pontneddfechan. This area to the south of the Brecon Beacons is known as Waterfall Country. There are numerous waterfalls in this area which include Melincourt Falls, Aberdulais Falls and Sgwd yr Eira.
Sgwd Gwladys is formed by water flowing over hard sandstone into a plunge pool below made up of soft mud rock. The rock is continuously eroding with 1.3 metres of rock is eroded approximately every 1000 years.