start on unclassified road just off resolven roundabout, access to tsw works, 16 yards north of r10/22 start point. proceed to resolven roundabout, (0.102 miles) taking 1st exit left southbound on a465 dual carriageway to aberdulais interchange (4.427 miles) bear left up around the loop to tonna roundabout (4.909 miles). take 1st exit left to main interchange roundabout (4.967 miles), circle roundabout to take 4th exit left down slip road to rejoin a465 northbound (5.363 miles). proceed northwards to resolven roundabout (9.562 miles), continue on a465 dual carriageway to blaengwrach roundabout (12.599 miles). take 1st left along cross-valley link to junction with b4242 (12.818 miles). bear left along b4242 southbound via pentreclwdau to resolven junction. continue south on b4242 via ynysarwed, rock & fountain to turn at break in dual carriageway at ynysygerwen (opposite factories entrance) (19.568 miles). retrace to resolven junction (23.050 miles). continue on b4242 passing rheola pond to finish at 25 yards beyond ‘ffermdy pentreclwydau’ in disused access (opposite start of r10/23) 25.014 miles)