Article 132

A constitutional law may, after the Regional Councils have been heard, provide for the merger of existing Regions or the creation of a new Region with a minimum of one million inhabitants, when so requested by as many Municipal Councils as represent not less than one third of the populations involved and the proposal has been approved in a referendum by a majority of said populations. Provinces and Municipalities which so request may, by means of a law of the Republic, after the Regional Councils have been heard and with the consent, expressed through a referendum, of a majority of the populations of the Province or Provinces concerned or of the Municipality or Municipalities concerned, be allowed to be detached from one Region and incorporated into another.