|Location Map ( geo)|
|Distance:||4.5 miles (7.2 km)|
|Meets:||B4246, A467, A4047|
|Route outline (key)|
The B4248 crosses the hills between two valleys in South Wales.
It starts on the B4246 on the outskirts of Blaenavon and heads northwestwards. The road becomes unfenced before losing its streetlights, although the fences do return from time to time. It climbs through Garn-yr-Erw and is soon out on the moors. After reaching a summit it descends to a cattle grid on the edge of the village of Llanelly Hill.
Immediately after is the point where the road used to cross the Blaenavon to Brynmawr railway line; this is long gone and there is little evidence that a railway line used to be here. The road is now fenced from this point on. It continues to descend, eventually reaching a roundabout on the A467 Brynmawr eastern bypass.
The original end of the road was slightly further on in the Market Place, on the original line of the A467 (formerly A4044) but now the road continues beyond that along the old A4045 which takes us less than half a mile to the road's present terminus on the A4047 (pre-bypass A465) on the western edge of town.