ENThe search for settlements of Final Palaeolithic-Mesolithic people on the seashore is directly related to the search for relics of the shores from the Early Holocene and the locations of rivers. Seismic surveys have allowed us to identify nine possible palaeo-valleys associated with the rivers Šventoji, Rąžė, Danė, Smeltalė and Dreverna. The identified palaeo-incisions are compared to elevation cross-sections of the river valleys visible in the current relief. The results obtained could lead to a detailed survey to study the riverbeds of the palaeo-rivers in detail, allowing for underwater archaeological excavations. Keywords: Baltic Sea, Lithuania, Flooded landscapes, Palaeo-incisions, Marine seismic survey, Underwater research. [From the publication]