Since a number of transversal issues have been cropping up, the need was felt for the existence of a unitary sistem to tackle them. So, the building of some cross-border cooperation structures both at local level (cross-border zones) and at regional level (crossborder euroregions) appeared as highly necessary and desirable. Their typology depends of the intensity and character of cross-border fluxes, the existence of local convergence cores, and of depends of complementariness and homogeneity between the frontier spaces. Starting from these theoretical-methodological considerations, the article presents the cross-border continuity of the Romanian ethnic element, the historical and geopolitical premises in which it evolued, with a case-study on the cross-border sector in the Prut Basin.