This article is about the Class III road numbered C671 maintained by DfI Roads. For other roads numbered C671, see C671.
The C671 is a road which generally runs parallel to the A5 between Mountjoy and Newtownstewart. The road starts on the A5 and heads north through the village of Mountjoy. From here the road passes over the eastern shoulder of Bessy Bell before dropping back down again towards Newtownstewart. In Newtownstewart the road follows Dublin Street and Main Street and meets the B84 on a tight corner in the centre of the village.