Recent analyses reveal that the vast majority of jihadists come from or have some connections with specific areas or districts within different states. They can be labelled as local/regional "hotbeds" of extremism. Molenbeek in Belgium, Gornje Maoče and Ošve in Bosnia-Herzegovina, Minneapolis in the US, Kasserine and Ben Guerdane in Tunisia, Sirte and Derna in Libya, Sinai in Egypt, Pankisi Valley and Dagestan in the Caucasus: each area has unique characteristics that lead to "exporting" fighters or creating new IS-controlled zones. Starting from the debate on the origin and nature of jihadist militancy that is dividing the most important scholars of Islam, this report outlines a broad spectrum of radicalization factors leading to the emergence of jihadists hotbeds, such as poverty, unemployment, lack of job prospects, juvenile delinquency, trafficking and smuggling, socio-political, economic and physical marginalization, the role of Salafist ideology as well as the influence of brotherhood networks. All these elements have been frequently highlighted as factors or triggers that could contribute to explaining dynamics of radicalization leading to active violent militancy under the ideals of jihadism.