peer reviewed ; Located at the interface between the Paris and the Rhine Basins and the more northern territories of Europe, Belgium contains several Gravettian occupations, both open-air and in caves. The available documentation is unfortunately limited by the earliness of the excavations conducted at most sites. Stratified records in karstic context, primarily excavated in the 19th century, are particularly affected by this situation. The analysis of Gravettian lithic technological behaviours can, however, rely on two open air sites excavated in the late 20th century which provide more rigorous data: Maisières-Canal and Station de l'Hermitage. These two sites have been the focus of comparisons that highlight their similarities, both in terms of the lithic industry and location. In fact, the former stands out for the presence of tanged tools, a typological marker which is usually associated with the Early Gravettian of Western Europe. In this article, we present a new study that evidences the differences in the lithic technical systems represented at these sites. After a presentation of the most recent data, we consider the causes that may be responsible for such diversity, highlighting the possible role of the chronological factor, but also of the existence of an original technical tradition in north-western Europe during the appearance and development of the Gravettian.