Abstract
A major reform, through the law of 27 January 2014 relating to the « modernisation of territorial public action and the affirmation of metropolises » (known as the MAPTAM law), the law of 16 January 2015 relating to the « delimitation of regions, regional and departmental elections and modifying the electoral calendar », and the law relating to the « new territorial organisation of the Republic » promulgated on 7 August 2015 (known as the NOTRE law) and implemented on 1 January 2016, makes significant changes to the organisation of the regions.This thesis work attempts to understand the reconfiguration of territorial powers between regions that are restructuring and metropolises that are emerging as a result of this territorial reform. To do this, the case study of the new Occitania Pyrenees-Mediterranean Region was chosen. The method used is an inductive method from a perspective of sociology of organizations, sociology of public action and political science.