Original: Cassis ( ; Occitan : Cassís ) is a commune situated east of Marseille in the administrative department of the Bouches-du-Rh ône in the Provence-Alpes-C ôte d'Azur region in southern France .
Simplified: It is found in the region Provence-Alpes-C ôte dAzur in the Bouches-du-Rh ône department in the south of France .