This master's thesis deals with the spatial interventions in the coastal area from the perspective of public cooperation in performing such interventions. Compared to the formal definitions and set procedures regulating spatial management on the mainland, a definite neglect and lack of regulations in the sea and narrow coastal strip area are noted. Legislation and spatial management procedures in these areas need to be revised, adjusted and updated. The situation has to be addressed in the shortest time possible and with a well thought out spatial development strategy. Developed societies definitely need to be informed of the events, to be involved in them and have the possibility to decide. The cooperation has to be based on a balanced combination of inclusion and limitation of rights, especially in the decision making processes. To remove limitations and problems of including the public in the decision making process, it is necessary to establish an open, flexible spatial planning system with a reciprocal discussion field, and a greater level of cooperation and trust between all the participants in the spatial management. The public has to be constantly informed in a comprehensive way, encouraged to participate and rise the degree of satisfaction with the (direct and indirect) values of living environment and space. The contents of the master's thesis are divided into two major parts. The first part includes analysis and synthesis of the selected literature, principles and limitations of legislative acts, defines what and how it is possible to intervene in the area of the sea and coastal strip and which protective measures have to be guaranteed while doing so. The second part pertains to the analysis of the position of the profession and the rest of the public, regarding the interventions in the sea and coastal strip area, and public participation. The second part explores individual opinions, and positions of the expert community and the public, predominantly by using quality analysis of the entry sources, implementation of in-depth unstructured interviews (discussions) with the members of the expert community (conducted in 2015, with 5 participants), and non-representative online survey (conducted in 2015, sample size 317). From the viewpoint of the individual or society (public), the experience and opinion on acceptable interventions for the specific area of the sea and coastal strip are also analysed. The findings are then quality analysed, and a new suggestion of a plan for public cooperation is prepared based on the synthesis of all other contents discussed herein. The useful result of the master’s thesis is a set of proposals for improvements, or an application of possible new approaches in the spatial management process and public cooperation. In the conclusion of the master’s thesis we formed also a preposition for improving public cooperation, based predominantly on the attitude change towards the public and use of informal cooperation approach. The proposed plan takes form of early informal approach to public cooperation. Guidelines for better and more efficient problem solving are also given, along with guidelines for public’s greater approval and acceptance of interventions in the space in general and specifically in the sea and coastal area.