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Aim. To identify land and water areas for inclusion in the regional ecological framework of Sevastopol City and to define the core areas for ensuring the representative character of the nature protection network and the ecological stability of the region.Material and Methods. Based on field surveys, archival and published data, the structure of the ecological framework of Sevastopol was specified as a part of the Crimean ecological network, developed in 2008. A schematic map of the protected areas and ecological framework elements was developed and calculation of their area carried out using the QGIS‐3.10.10. The index of environmental significance was calculated according to Guryevskikh and a scale for its gradation was suggested. For ecological centres and corridors, the ratio of key areas of the first and second order was analyzed.Results. The creation of 34 protected areas was proposed and their conservation value was shown. The boundaries of the core areas and 11 structural elements of the ecological framework were specified, its representativeness was characterized and problems of its implementation were discussed. As a result of optimization of the nature protection network of Sevastopol, the share of the protected areas and ecological framework of the total area of the city will be increased to 37.1 and 66%, respectively. A complex of conservational measures has been proposed for the protection of populations and biotopes of rare species included in the Red Data Book of Sevastopol.Conclusions. The creation of new core areas and the optimisation of the nature conservation network will ensure the maintenance of the sustainability of the ecological framework and the ecological stability of the region but will not make significant changes to the previously formed disproportion due to the impossibility of creating large objects with a high category of protection. The implementation of the ecological framework project will help to reduce the risk of losing the biological and landscape diversity of the region.

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