The implementation of regional cooperation frameworks such as the Greater Mekong Subregion (GMS) in the 1990s is likely to give more functions to cities located near or on the international borders. Under this economic and institutional context, Thai bordertowns, which are third-rank cities, and their counterparts in Laos, are transformed by an internationalization process, characterized by rising cross-border flows, the empowerment of transnational stakeholders, the emergence of unprecedented urban functions and the creation of new internationalized forms (such as cross-border transport infrastructures or special economic zones). Spatial organization at the urban scale suggests however that these dynamics differ on each side of the border,...