The main objective of this project is to complete the NATURA 2000 network in the marine environment, in accordance with the requirements of the Habitats Directive. The project will provide a comprehensive methodological approach to exploring the distribution of species and their populations, as well as natural habitat types in marine areas, and determining their conservation status (CP). If necessary, new marine protected areas (MPAs) will be designated and/or the boundaries of existing marine PPAs adjusted. It will lay the foundations for joint monitoring under the Habitats Directive, the Water Framework Directive and the Marine Strategy Framework Directive. Planned activities: Organisation and management of the project; Development of technical specifications and requirements for the survey of the distribution of the target sites and their populations, as well as the definition of their CPs in the maritime areas of Bulgaria, in accordance with the attached list (Annex 1); A study of the distribution of the target sites and their populations and the identification of their CPs in the maritime areas of Bulgaria, according to the attached list (Annex 1); Evaluation and control of data; Information and publicity, Expected results: Technical terms of reference for the main Action 3 of the project; methodological approach for mapping and assessment of the CP of the target sites; established distribution and CP of the target sites; definition of new/update of the boundaries of marine protected areas; completed GIS database with spatial data; synchronised and optimised data collection processes and their reporting under the Habitats Directive, WFD and MSFD; updated standard forms of areas including marine waters; guidance on the identification of marine habitats; established/updated schemes for monitoring the target sites; reliability of the results obtained.