Input (grade 7): Boulbon is a commune in the Bouches-du-Rh Ã ne department in southern France.
Output (grade 5): Boulbon is a commune of 1,510 people (1999). It is found in the Provence-Alpes-C Ã te d'Azur region in the Bouches-du-Rh Ã ne department in the south of France.