The Paris-Saclay project is emblematic of the transition of the to a more polycentric vision of the Greater Paris project, more polycentric, which seeks to link and structure together coherently the larger hubs of activity, gradually going beyond the old Paris to suburbs pattern. The Saclay plateau braught together, a few kilometers from Paris, the ingredients necessary for becoming an international research and innovation center. Historically fragmented by the piecemeal setting up of various establishments, territorial unity was far from obvious. Though the creation of a unifying landscape appears as one of the principal means for organizing such a vast site, only its integration into the geography can give it relevance. We chose to clearly assert its identity on the perimeter, by respecting its empty spaces given over to agriculture, highlighting its wooded boundaries, and intensifying its existing urban pockets. An amplified geography that will welcome roads of all kinds, new infrastructure elements, as well as water management systems. With the identifiable territorial framework strengthened in this way, it comes to constitute a powerful support for the overall servicing of the site. The landscape is made up of a geography of institutions in which the interstitial spaces are as important as the objects themselves. A progressive and continuous gradation is established, running from the “artificial” landscape at the heart of the campus to the naturalistic landscape of amplified geography. The cluster is a hierarchical and united archipelago of campus-parks, linked both to one another as well as to the developed valleys.