Having climbed up from Talybont on Usk alongside the reservoir to essentially the foot of Pen y Fan, this next section of the Taff Trail is a delight. There's a short section of road, including a fast decent, before turning in to pick up forestry fire roads of hard packed loose stone that lead you to the banks of the next reservoir, Pontsticill, there's a further forestry section, with a draggy climb before you pop out at Pontsticill village, don't miss the sharp left at the Red Cow pub as this take you to the disused railway path. This section in particular is a glorious gradual decent on traffic free cycle way to Merthyr Tydfil, perfect for all the family! If you're not getting to Merthyr Tydfil but instead heading to Abergavenny on the NCR 46, don't join the railway path but instead stay on the road