This book presents the project called “Bug river valley as the ecological corridor : state, threats, protection” that focusses mainly on the preservation and restoration of the biological diversity of the Bug river and its valley as well as on the promotion of the nature values of the Bug river and its valley. The project also aims at starting a long-term international cooperation between Poland, Ukraine and Belarus in order to design and implement a sustainable management plan for the conservation of nature in the Bug river valley. This book is an abridged version of the full report published in Polish.