Simplify the following text for a Grade 7 native English-speaking person.
Original: SeptÃ mes-les-Vallons is a commune in the Bouches-du-Rh Ã ne department in southern France .
Simplified: SeptÃ mes-les-Vallons is a commune of 10,202 people ( 1999 ) . 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 .