Lake sediment cores offer a comprehensive record of Late Pleistocene/Holocene environmental changes because of the continual accumulation of sediments. Within the scope of the proposed project, detailed geochemical (elemental analysis, organic carbon, stable isotopic composition, biomarkers) and radiocarbon analyses will be determined in karst lake, wetland and polje (Lake Visovac, Lake Vrana near Biograd, Nadinsko blato). Continuous sedimentary sequences are scarce in karstic areas like Dinaric karst along the Eastern Adriatic coast, therefore, lake sediments are a valuable source of information. Geophysical investigation in lakes and poljes (sub-bottom profiler, multi-beam sonar, georadar) allows the determination of detailed geomorphological setting and 2D, as well as 3D visualization of the lake-bed and polje geomorphology. The elemental, isotopic, or molecular constituents of a lake and its sediments reflect both external chemical inputs and the lake’s internal biogeochemical cycles. Geochemical, mineralogical and sedimentological characteristics, together with paleontological fossil remains (ostracods) and fossil molecules (biomarkers) extracted from sedimentary archives, will be used to reconstruct past environmental conditions. The project goal is to reconstruct past environmental changes in lakes by combining geophysical remote sensing and multi-proxy sediment core data, publish the project results and get the basis for the application of a competitive scientific project. The paleolimnology network would include the study of freshwater lake Lake Visovac, transitional freshwater-wetland lake (Lake Vrana near Biograd, Jasen area) and karst polje Nadinsko blato in the karst part of Croatia.