Article L3114-1 of the French General Code of Local Authorities
I. – Several départements in the same region forming a single territory may, by joint decision of their departmental councils, adopted by a majority of three-fifths of the votes cast, request to be grouped together to form a single département. The opinion of the relevant Comité de Massif is required if one of the departments concerned includes mountain areas within the meaning of article 3 of law no. 85-30 of…