This operation consists in the elaboration of a master plan of the Mediterranean-Rhône-Saône axis in order to build a river-sea complex with its own governance starting from the three Mediterranean ports, Marseille-Fos, Sète and Toulon, with the GPMM at the bridgehead towards the entire natural hinterland consisting of ports along the Rhone River and its main tributary, the Saône, and rail services. To develop the master plan in a concerted manner, a project management study and assistance service was entrusted to a group of design offices to support the project management constituted by the infrastructure managers CNR, Grand Port Maritime de Marseille Fos, the Ports of Sète and Toulon, SNCF Réseau and VNF.