The partners of Agence Ter (Henri Bava, Michel Hoessler, Olivier Philippe) approach their territories with the genius of the engineer who develops landscapes according to the immanent ecologic of the site itself, and with the sensitivity of the landscape architect who designs land for people to experience. In the process, they often cross territorial boundaries, whether it be in their park for the state garden show Aqua Magica on the border between Bad Oeynhausen und Löhne in Westphalia, whose concept is based on subterranean watercourses; in their development plan for the cities and towns of the Ile de Cayenne conurbation in French Guiana, whose logic is based on siltation, sedimentation processes, hydrology, and infrastructure; or in their design for the Euregio Maas-Rhein (Meuse-Rhine Euroregion) in the Holland-Belgium-Germany border triangle, whose development is based on an underground coal deposit that has produced a specific landscape, a landscape whose identity can now be further developed as a "green metropolis."