Abstract

Cross-border cooperation (CBC) is defined as the structured, institutionalized, or informal collaboration between adjacent regional and local authorities, economic actors, and civil society groups across international state borders. Within contemporary border studies, CBC has transitioned from traditional top-down, state-centric diplomatic containment toward bottom-up, grassroots territorial integration. This entry synthesizes the multidisciplinary evolution of CBC across geography, economics, jurisprudence, sociology, and political science, structuring the analysis around four core dimensions: spatial, political, economic, and socio-cultural. It categorizes diverse territorial and governance mechanisms of cooperation, ranging from localized town twinnings to formalized Euroregions and European Groupings of Territorial Cooperation (EGTCs), and introduces quantitative performance metrics such as the Cross-Border Activity Index (CBAI). Examining how these structures operate along both the internal and external borders of the European Union, this entry analyzes the cyclical, non-linear dynamics of the bordering–debordering–rebordering framework. By evaluating diverse theoretical models across varying geopolitical contexts, it identifies the universal characteristics of contemporary border dynamics, conceptualizing borders not merely as physical or political demarcations, but as analytical lenses reflecting broader processes of globalization, regionalization, and territorial resilience.

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