Abstract. - Euroregio is a GEIE (Economic European Group) which reassemblies Nord-Pas-de-Calais, Flandre, Wallonie, Bruxelles and Kent. This association forms a homogeneous region (human density, industrial past, significance of metropolis). It forms a perfect laboratory to study the physical and geopolitical recomposition of space because of metropolisation dynamics through concepts of frontier geography. The author shows that new frontiers appear. But is it significant to oppose nowadays minor frontiers (international boundaries) to greatest frontiers (town/country, intra-urban frontiers) of metropolis ?Résumé. - L'Eurorégion au sens du GEIE (Groupement Européen d'Intérêt Economique) du même nom, a vu le jour en 1991. Elle réunit le Nord-...