|From:||Dyffryn Castell (SN771814)|
|Via:||Devil's Bridge, Tregaron|
|Length:||24.7 miles (39.7 km)|
|Meets:||A44, A4120, B4574, B4340, A485, A482|
|Route outline (key)|
The B4343 runs for some 40 km southwestward across Cardiganshire in mid Wales, from Dyffryn Castell to Cwmann near Lampeter.
The road starts on the moors below Bryn Glas (the southernmost ridge of the Plynlimon massif), where it forks left from the westbound A44 to cross the River Castell and Nant Fuches Wen and wind round Banc Bryn-chwith to join the A4120 at Tyn-y-ffordd in the Vale of Rheidol.
The A4120 now takes over our route for the next 3.5 km down to Devil's Bridge, at the exit from which the B4343 regains its independent existence by forking left at the village's war memorial. The route now climbs again, crossing more moorland before descending through woods and a series of hairpin bends into the Ystwyth valley, joined halfway down by the B4574, which has taken a much longer route from Devil's Bridge.
After crossing the river, the B4343 runs through the former mining village of Pont-rhyd-y-groes and the smaller Ysbyty Ystwyth. Continuing southward against the grain of west-flowing streams, we eventually arrive in Pontrhydfendigaid on the River Teifi. Heading southwestward along the left bank of the Teifi (although at a short distance from the river itself), through now generally much lower-lying country, the route reaches the market town of Tregaron, where it turns left and cannons off the A485 at a crossroads by the bridge over Afon Brennig (a tributary of the Teifi).
In the Market Square the B4343 takes a sharp right to resume its southwestward course. It passes through Llanddewi Brefi and Llanfair Clydogau to terminate on the A482 at Cwmann, shortly after entering Carmarthenshire. A kilometre away, across the Teifi to our right, lies the town of Lampeter, which we could also have reached from Tregaron by following the A485 along the other bank of the river.