Greater Geneva brings together pieces of space from four political entities. Once inward-looking, Geneva no longer has the choice of an isolationist and protectionist objective, although it does not have the means of a regional policy on its own; the space joined by these two national entities is becoming a collective issue for the regional metropolis, a project space, a political construction. The task is to balance housing and employment, to create multimodal transport networks, and to exploit opportunities for cooperation. The fact remains that the border divides as much as it unites, but it also creates potential. The border remains and must remain a limit of identity, a resource as a line of contact, because cooperation is enriched by difference. Today, in the context of a Europe of regions and border margins, the sources of bipartite enrichment are gaining new momentum.