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This study moves beyond theories emphasising “state failure” as the cause for terrorist “spill-over”. The aim is to offer new theoretical and empirical considerations concerning the determinants of terrorist groups’ geographical strategies. The main argument this article presents is that transnationality for nationalistic terrorist organisations can be costly. This is the case due to the mobility, social and strategic costs of operating beyond controlled territories. Hence, the article proposes an interpretation of these decisions as being mainly generated by states’ counterterrorism strategies. Using data gathered from the GTD Dataset and secondary sources such as specialised reports and strategic documents, the article explores the argument by presenting observations and empirical findings on two groups, AQIM and Boko Haram