The study area represents the boundary zone between the African and European plate i.e., the contact between the Adriatic microplate as part of the African plate and the Pannonian basin as part of the European plate. This investigation is a continuation of geophysical studies focused on the Dinarides and its adjacent areas. Local Earthquake Tomography method (LET) was used in order to improve our understanding of the crustal structure and its relationship to the upper mantle in the contact area between the Adriatic microplate and European plate. P-wave travel-times are calculated from earthquakes, which were recorded by temporary and permanent seismic stations placed in the survey area. Phase arrivals (Pg and Pn phases) were manually picked. Datasets of P-wave travel times are inverted to recover a three¬dimensional P-wave velocity model of the survey area. Two datasets were used in this study: (1) data recorded on 15 temporary seismic stations, which were deployed in Croatia in the framework of ALPASS-DIPS project, and (2) travel time datasets from the Croatian Seismological Survey and ORFEUS databases. The study resulted in a new crustal and upper mantle three-dimensional (3D) P-wave velocity model, which provides new insights on deep geologic features. The data enabled resolution of less than a hundred kilometres in horizontal directions and a few kilometres in vertical direction in the area with good ray coverage, as documented by the resolution tests. The model is correlated with previous 1D and 2D models in the survey area allowing to infer the main structures with higher confidence. The inverted velocity model shows that the crust under the Dinarides is characterized by relatively stronger lateral and vertical velocity changes when compared to the crust in the Pannonian basin area. The strong velocity increase in the crust below the Dinarides indicates that the Dinaridic crust could be interpreted as two-layered, while the Pannonian crust is probably one-layered. There are relatively high velocities below the northern Dinarides in the uppermost crust, and low velocities caused by deep local depressions in the Pannonian basin. The velocity model reveals crustal thickening beneath the Dinarides and significant crustal thinning beneath the Pannonian basin. The most reliable feature in the model concerns the structure of the lower crust and uppermost mantle. The Moho shape can be determined in vertical cross sections based on the highest vertical velocity gradient in the lower crust and the depth of the boundary corresponds to the velocity surface of approximately 7 km/s. There is a deep low-velocity zone beneath the Dinarides, which extends to a depth of more than 55 km and has characteristic NW SE trending. The pronounced low-velocit y anomaly (Vp less than 7,5 km/s) is surrounded by higher velocity, typical for the uppermost mantle. This anomaly is interpreted as the fragmentation in the uppermost mantle. High¬velocity and low-velocity alteration in the narrow area below the Dinarides could be the first geophysical evidence of the contact of Adriatic and Pannonian mantles. According to the velocity pattern, the contact zone can be located on the NE flank of the Dinarides.