This document is available in French as well : L’Etat, les frontières et le territoire au Sahel : Cas du G5 Sahel. This Policy Brief highlights the depths of the Sahel crisis. Some aspects of the crisis, such as extremist violence, migration, transnational crime and precariousness, are in fact symptoms of a disease that will only get worse if the real and deep causes are not addressed. Exploring the case of the G5 Sahel as a framework for the convenience of study and analysis does not imply that the crisis is limited to the five countries that are part of the G5 Sahel. Indeed, while specificities must be taken into account, we must recognize certain difficulties, particularly structural ones, that remain common to all the countries of the region.