The territorial boundaries of the regions shall be amended by law after consultation with the regional councils and departmental councils concerned.
The modification of the territorial boundaries of the regions may be requested by the regional councils and departmental councils concerned.
However, when a decree of the Conseil d’Etat modifies the territorial boundaries of adjacent départements not belonging to the same region, and a favourable opinion has been issued by the departmental councils and by the regional councils, that decree entails the modification of the boundaries of the region.