The thesis presents the conceptual design of the spatial arrangement of the shoreline strip between Koper and Izola. Based on statistical, geographical and other analyses of the individual spatial phenomena the thesis examines in more details the actual spatial conditions. Those research findings were the basis for further decision making in the planning of spatial interventions. The concept, including the proposal of the placement of an artificial island in the marine region between Koper and Izola, was verified through a survey with the local population. The wishes and needs of the local population have been then included in the submitted conceptual design for the spatial arrangement of the shoreline strip between Koper and Izola. Proposals for further research and guidelines for spatial planning in the considered area are presented in the conclusions. The thesis also highlights the importance of the public participation in the spatial planning process. The professional approaches, methodology, applicable regulations and current state of the public participation in spatial planning process in Slovenia and abroad are summarised.