G5 Sahel or G5S (French: G5 du Sahel) is an institutional framework for coordination of regional cooperation in development policies and security matters in west Africa. It was formed on 16 February 2014 in Nouakchott, Mauritania,[2] at a summit of five Sahel countries: Burkina Faso, Chad, Mali, Mauritania, and Niger.[3] It adopted a convention of establishment on 19 December 2014,[4] and is permanently seated in Mauritania.