River Foyle
The N15 commences halfway across "Lifford Bridge" (which crosses the River Foyle between County Donegal and County Tyrone), continuing the route of the A38 (from Strabane on the east side of the river). In Lifford, west of the River Foyle, the N14 meets the N15, ending at a junction in the town centre. The N15 leaves to the southwest, changing to run west at the point just west of Clady. It continues west through Castlefin, Liscooley and Killygordon to reach Stranorlar.