It begins on junction of the A40 and A465 south of Abergavenny and then travels southwards towards Little Mill north of Pontypool.
This was in the belief that its presence would be a landmark for the Luftwaffe seeking to raid the nearby Royal Ordnance Factory at ROF Glascoed to the east beyond Little Mill.
There is a fire station located on New Road that serves the Pontypool, Griffithstown, Sebastopol and New Inn, and the surrounding villages of Little Mill and Penperlleni.
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The Grande Ronde River flows through the valley; its tributaries include Catherine, Fir, Ladd, Little, Mill, Pyles, and Willow creeks.