From the lay-by, we cross over the dam between the Pentwyn and Pontsticill Reservoirs and follow the minor road under the Brecon Mountain Railway and towards the Parkwood Outdoors Dolygaer into Cwm Callan. The route continues through Cwm Callan to reach Pen Bwlch Glasgwm and join the bridleway between Pant and Talybont on Usk. We follow the bridleway towards Talybont Reservoir and we join the Beacons Way at Pen Rhiw-calch and onto the stone circle at the base of Tor y Foel. We then climb to the summit of Tor y Foel and return to the stone circle and return via the outwards route back to the start.
If you do not want to climb Tor y Foel, you can stay at the stone circle and wait for the returning walkers