This article addresses the tension between the conception of a conflict and the ensuing response as regional or as transregional. The empirical focus is the military response within the Multinational Joint Task Force (MNJTF) – comprised of Benin, Cameroon, Chad, Niger and Nigeria – against Boko Haram. This response is situated in a regional context, as its coordinating forum is the Lake Chad Basin Commission (LCBC), but also in a transregional one, through the cooperation between two Regional Economic Communities (RECs), the Economic Community of West African States (ECOWAS) and the Economic Community of Central African States (ECCAS). This article cautions that neither of these two framings is a given. Rather, particular actors produce and reproduce the regional or respectively transregional character of a security concern as well as its response.