Gignac-la-Nerthe is a commune of 9,140 people ( 2004 ) . It is found in the region Provence-Alpes-C Ã te d'Azur in the Bouches-du-Rh Ã ne department in the south of France .
Gignac-la-Nerthe is a commune in the Bouches-du-Rh Ã ne department in southern France .