Throughout history, the functions and roles of borders have been continuously changing. They can only be understood in their context, shaped as they are by history, politics and power, as well as cultural and social issues. Borders are therefore complex spatial and social phenomena which are not static or invariable, but which are instead highly dynamic. This comprehensive volume brings together a multidisciplinary team of leading scholars to provide an authoritative, state-of-the-art review of all aspects of borders and border research. It is truly global in scope and, besides embracing the more traditional strands of the field including geopolitics, migration and territorial identities, it also takes in recently emerging topics such as the role of borders in a seemingly borderless world; creating neighbourhoods, and border enforcement in the post-9/11 era.