Sgwd Isaf Clun Gwyn
The Afon Llia and the Afon Dringarth both start in the mountains. They flow for a few miles until they meet and become the Afon Mellte. The Afon Mellte cascades over many waterfalls, one of them being the Sgwd Isaf Clun Gwyn. In Pontneddfechan, the river becomes the Afon Nedd / River Neath.