Input (grade 7): Fos-sur-Mer is a commune in the Bouches-du-Rh Ã ne department in southern France.
Output (grade 5): Fos-sur-Mer is a commune of 15,700 people (2005). 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.