Article R4134-8 of the French General Code of Local Authorities
The regional economic, social and environmental council sits at the regional capital. The president of the said council may, with the agreement of the president of the regional council, convene it in another location. As an exception to the previous paragraph, in the regions grouped pursuant to the loi n° 2015-29 du 16 janvier 2015 relative à la délimitation des régions, aux élections régionales et départementales et modifiant le calendrier…