The many problems of the Baltic Sea, worst of all the eutrophication, impact the habitat types of marine environments. Habitat types are areas of land or water with certain environmental conditions and plant and animal species. Their well-being is the prerequisite for using the sea for recreation and economic purposes.
Half of the underwater habitat types of the Baltic Sea are either endangered or extremely endangered. The most endangered habitat types are close to us in the Archipelago Sea and the Gulf of Finland where the human impact on the marine habitats is the greatest.