The document, among other things, welcomed the progress of Croatia and Montenegro on the road towards the European Union.
The declaration also stressed the importance of joint ecological projects and environmental protection.
It underlines that increases in the volume of transport by sea and in waste from the mainland pose increasing threats to the ecological systems of the Adriatic and Ionian Seas.
The declaration, that also underlines that it is necessary to consider detrimental effects of unilateral projects, was signed by officials of Italy, Slovenia, Croatia, Bosnia-Herzegovina, Montenegro and Greece.