This paper is part of a PhD research with the aim to gain a better understanding of (i) the spatial conditions and performance of the territories-inbetween and (ii) the relations between the spatial structure of territories-inbetween and the policy-making concerning regional planning and design. Messages for planners and policy makers are derived based on this better understanding in order to support planning sustainable territories-inbetween in a networked city region.UrbanismArchitectur