Territorial entitles and thus has influenced relations between them. In particular, these changes influenced the relations between the metropolis and its hinterland. Contemporary metropolis became a concentration of innovative activities that led to development of flows within world cities network. As a result its ties with regional surrounding, that offers mainly "simple" resources, has became relatively weaker. The article demonstrates these new processes by the empirical research of three Polish metropolises: Warsaw, Poznan and so called Triple-city (Gdansk-Gdynia-Sopot).
Tri-City, with the suburban area, like other Polish urban centres with metropolitan aspirations, has real chances for becoming metropolitan area of European importance. According to some European concepts, Tri-City is recognized as a member of the group of European metropolises and regarded as a link in the zone of high dynamic development in the Baltic Sea Region. The main problem for the functional efficiency of Tri-City agglomeration is cooperation and competition between cities and municipalities. The lack of common activities can be the reason of efforts and effects to squander in the field of spatial planning, programming of regional development and functioning of the whole settlement system of the metropolitan area. Pursuing the integration of Gdansk, Gdynia and Sopot and thus creating an integrated metropolitan space of the highest ability to compete in the global economy, is a real challenge for the Tri-City.
