The reader may be amazed when they are faced with the sheer number of territorial divisions associated with public action, and full of questions. What justifies this diversity? What are the problems that arise from these divisions? Why don't the limits of public action simply follow administrative and political subdivisions? Territorial Division for Public Action focuses on the situation in France, proposing three different approaches. First, we consider the functions that are associated with these territorial divisions: equitable distribution of resources across the territory, administration and the management of public services. However, they are also a tool for maintaining power. Lastly, we consider the effects these divisions have on the implementation of public action and on socio-spatial structures. These divisions reflect political projects, which embody the issues as much as the partition design itself does. The recent reform of territorial regions, alongside a gradual imposition of intercommunal links in France, has given rise to political debates at both local and national levels.