ChÃ cents teauneuf-de-Gadagne is a commune of 2,838 people ( 1999 ) . It is located in the region Provence-Alpes-C Ã te d'Azur in the Vaucluse department in the south of France .
ChÃ cents teauneuf-de-Gadagne is a commune in the Vaucluse department in the Provence-Alpes-C Ã te d'Azur region in southeastern France .