|Location Map ( geo)|
|From:||Dyffryn Cellwen (SN856101)|
|Distance:||2.8 miles (4.5 km)|
|Route outline (key)|
The A4221 makes up the northern section of the Inter-Valley Road, which crosses the hills between the Vale of Neath and the Swansea Valley. The road is modern and well-aligned, being constructed to bypass the narrow road through the small villages in this area.
The A4109 takes the Inter-Valley Road from the Vale of Neath onto the hills. On the edge of Dyffryn Cellwen that road TOTSOs left and the A4221 takes on its alignment. It starts off as a dead-straight road over the moors. Presently a crossroads is reached - the road crossing was the original right-of-way in this area; the village of Coelbren is off to the right.
The A4221 bears left here to run along another dead-straight section and soon starts to descend. There's a turn right for Coelbren and the local monkey sanctuary and the road bends a bit to lessen the gradient. Shortly we pass straight through the middle of Caehopkin as a throughpass; one road leaves the A4221 to access the village. We continue on our descent and soon bear sharply right to a T-junction on the A4067 Abercraf bypass.