This article is about the Class III road numbered C665 maintained by DfI Roads. For other roads numbered C665, see C665.
The C665 forms a long and very indirect route from the B46 near Fintona to the B84 near Dromore. The road initially heads north west from Fintona towards the A32, passing through a crossroads with the C663 at The Diamond. The road soon passes underneath the A32 and TOTSOs left (west) at a crossroads next to All Saints Primary School. Keeping south of the slopes of Pollnalaght, the road eventually reaches the B84 north of where the latter meets the B4. The route continues by turning off to the south of this stretch and after negotiating a pair of TOTSOs, it reaches the B4. The road continues south from a junction to the west and reaches the B84 outside of Dromore. The C665 also includes segments of the former A32 between Tattysallagh and Clanabogan which can be accessed both by the existing A32 and by the main line of the C665.