This circular walk takes you around the beautiful Pontsticill Reservoir in the Brecon Beacons National Park. The reservoir is located a few miles north of Merthyr Tydfil on the Taff Trail. You can catch the splendid Brecon Mountain Railway to Pontsticill station next to the reservoir. The railway runs from Pant near Merthyr Tydfil along the full length of the Pontsticill Reservoir to Torpantau high in the Brecon Beacons.
The walk starts near the Dam and Pontsticill station and heads along the Taff Trail through a woodland area on the western side of the reservoir. You return on the eastern side, climbing towards Cwm Criban for splendid views of Pontsticill and the surrounding countryside. You then descend towards the dam and the finish point.