The organisation named Communauté de Communes Arc Sud Bretagne is a group of municipalities in the department of the Morbihan, in Brittany. The total population of this intermunicipal organisation is 29034 inhabitants, spread across a surface area of 352.91 km². The population density is 226 inhabitants/km². The maximum altitude is 92 metres. The Communauté de Communes Arc Sud Bretagne public intermunicipal cooperation establishment comprises the 12 municipalities listed below.