Abstract: „The notion of border in the Merlovingian period at the confines of Neustria and northern Austrasia is, in this paper, the object of a strictly archaeological approach. It shows that archaeology often relies on natural geographical, ecclesiastical or cultural limits that undoubtedly define territories, but whose meaning and political fluctuations are but very partially reflected by material sources. The natural environment, the identification of efficient cultural criteria, the occupation of the land, the social and economic interpretation linked with the status of the rural and urban communities don’t allow yet to analyse their relations with real regional territorial entities. In this respect, we believe we can assert that the archaeological analysis of our regions is still carried out on territories with « limits without borders ».“