This article provides new empirical insights on the external dimension (ED) of European Union (EU) migration and asylum policies (MAPs) as a case of securitization, by mapping its policy tools across time and space. More specifically, the goal of the article is two-fold. It engages into a new mapping exercise that enables an understanding of how ‘geographically spread’ the ED of EU policies on migration and asylum is, as well as providing insights into ‘where’ and ‘what’ the EU has externalized in the last twenty years. Second, it assesses to what extent the number, type and distribution of ED policy tools reflect dynamics of the securitization of migration and asylum. The article builds upon the literature on securitization and externalization, looking at it afresh by adopting a perspective focused on policy tools. Empirically, the analysis is based upon a new comprehensive database containing data on 153 ED tools according to their characteristics and regions. The article argues not only that policy tools characterize the ED as a further feature of the securitization of migration, but also that externalization through practices of securitization has not been limited to the EU immediate borderlands but has rather spilled over across regions and frontiers. Externalization; migration policies; securitization; policy tools; border control; return and readmission; asylum