The organisation named Communauté de Communes de l'Oust à Brocéliande Communauté is a group of municipalities in the department of the Morbihan, in Brittany. The total population of this intermunicipal organisation is 40207 inhabitants, spread across a surface area of 640.13 km². The population density is 78 inhabitants/km². The altitude varies between 1 metres and 212 metres. The Communauté de Communes de l'Oust à Brocéliande Communauté public intermunicipal cooperation establishment comprises the 26 municipalities listed below.