This article is about the Class III road numbered C657 maintained by DfI Roads. For other roads numbered C657, see C657.
The C657 is a long cross country C road in County Tyrone. It starts on the A5 and heads south east, soon meeting the B46 at a crossroads. Continuing south, the road meets the C682 at another crossroads and crosses over the Routing Burn. The road quite suddenly swings to the east as it passes its junction with the C658 and crosses the C630, before a further abrupt change of direction towards the south east. A spur leaves the main route here and returns northwards to the A5. Continuing south east, the road eventually comes to an end at a T junction on the C650 at Errigal.