Rethinking the In-Between: Designing with a socio-ecological approach to activate the potential of Terrain Vague spaces

Abstract

Rapid and uncontrolled processes of urbanisation have generated Terrain Vague spaces—abandoned hybrid spaces where urban, rural, and wild dimensions mingle. These areas offer rare socio-ecological opportunities and hold significant potential for addressing contemporary urban challenges, yet remain under threat from conventional development pressures. This article proposes a socio-ecological approach to recognising, preserving, and activating the value of Terrain Vague spaces. Drawing from extensive literature, the authors identify guiding principles and synthesise ecological, social-economic, and cultural-aesthetic values. Through a set of nine case studies—including the High Line (New York), Parc aux Angéliques (Bordeaux), Parc Henri Matisse (Lille), and several community-led micro-interventions—the article demonstrates how innovative practices can bridge the gap between theoretical frameworks and real-world projects. The study concludes by outlining indicative strategies for future interventions, emphasising ephemerality, indeterminacy, multiscalarity, diversity, and the redefinition of margins as connectors in contemporary cities.