This book provides a sophisticated analysis of cross-border challenges and problems in the southern African region. It advances explanations that transcend the state-centric narrative that has nationalised cross border security. It provides insights from non-state actors such as informal cross-border traders (ICBTs), informal cross-border transporters, undocumented migrants and cross-border communities. It argues that security needs to be understood beyond a state-centric paradigm by focusing on the political, economic, environmental and societal threats at macro, meso and micro levels. The book suggests that at the core of cross border security challenges in the Southern African region is a post-colonial governmentality. This drives the nationalisation of cross-border security as though it is the only security leading to nation-states, in turn depoliticising and invisibilising the security and livelihoods of ordinary people, even when nation states claim to be protecting the same. The book will be a useful resource for students, scholars, and researchers of African Studies, Border Studies, Human Geography, Migration Studies, Development Studies, International Studies, International Relations, Political Science and Security Studies.