A Conceptual Framework for the Relationship Between Terrain Vague and Urban Ecology

While post-industrial cities generate global environmental issues as centers of intensive production, consumption and waste; the continuous dynamic of urban transformation creates fragmentation within the urban fabric, inevitably producing residual spaces. Although these sites, conceptualized by Ignasi de Solà-Morales as “terrain vague”, are often perceived as undefined, abandoned or obsolete zones, they hold the potential to contribute to urban resilience. This study conceptualizes the socio-ecological functions of these spaces by reinterpreting terrain vague from the perspectives of architectural theory and urban ecology. A qualitative content analysis of selected literature was conducted. Recurring conceptual themes were systematically coded using MAXQDA software and classified into five main categories—spatial, urban, liminal, social and ecological characteristics. By analyzing category overlaps and conceptual connections, a holistic conceptual framework regarding the relationship between terrain vague and urban ecology was established and visualized. Findings indicate that terrain vague represents not only physical voids but also dynamic ecosystems that enhance biodiversity, enable alternative public uses and support spontaneity. The study demonstrates that terrain vague serves as a conceptual bridge between architectural theory and urban ecology, constituting a reference for sustainable, resilient urban design strategies.