Brecon Beacons The route soon connects with Route 46 at the Heads of the Valleys road, and travels over the Fforest Fawr mountain range to Trecastle at the northern boundary of the Brecon Beacons National Park. Builth Wells The route continues on minor roads across the west flank of Mynydd Epynt, to Tirabad and Llangammarch Wells, then on to Builth Wells where it joins Route 8 (Lon Las Cymru). External links Sustrans Route 43 Cycleways in Wales Transport in Swansea Transport in Neath Port Talbot Cycleways in Powys Fforest Fawr Epynt Swansea Valley