[9] According to the EURBANET project by Delft University of Technology[10] it speaks about polynuclear urban region when there exists a series of important urban centers that relate intensely among them and to the exterior.

This one is the case of bordering zones to the urban region that they extend around the cities of Tarragona and Girona.

They are narrow corridors well communicated to Barcelona, both by highway and railroad, which there fuse the metropolitan areas of these cities with the urban region.

Barcelona Polynuclear Urban Region is conceived as "isolated islands of significant growth" which, may develop into zones of global economic integration.

This is, however, not intended to happen at the cost of the global competitive position of the present core area.