This Critical Dictionary on Borders, Cross-Border Cooperation and European Integration takes up the challenge to answer these questions. It is the first encyclopedia, which combines two so far not well-interconnected interdisciplinary research fields, i.e. Border Studies and European Studies. Organized in an alphabetical order, it contains 209 articles written by 124 authors from different countries and scientific disciplines, which are accompanied by 66 maps. The articles deal with theory, terminology, concepts, actors, themes and spaces of cross-border cooperation at European borders and in borderlands of and around the European Union (EU).