RT Journal Article T1 The (Re)Industrialised Waterfront as a “Fluid Territory”: The Case of Lisbon and the Tagus Estuary. A1 Costa, Joao Pedro A1 Andrade-Marqués, María José A1 Dal Cin, Francesca K1 Cuencas hidrográficas - Portugal K1 Tajo (Portugal, Delta) K1 Desarrollo urbano AB If delta and estuary areas are observed under the perspective of a double system of dynamic infrastructures, the object of parallel “water/urbanisation” processes, the interface spaces become key nodes. In this perspective, port and waterfront areas can be described as spaces of mediation. The article argues that in the case of Lisbon and the Tagus, as possibly in several other port cities, these edge spaces can be described as “fluid territories.” The pre-eminent characteristic of “fluid territories” is that they are not permanent, neither in space nor time. These areas present accelerated transformations, less defined boundaries, and an increased spatial and management complexity. Moreover, “fluid territories” also mediate (a) the culture-natural environment, with human action appropriating the natural system through infrastructure and urbanisation, and (b) the industrialised economic estuary, with its continuous updating. To demonstrate this hypothesis, two samples of Lisbon’s riverfront are observed, recording its constant variability over the last 200 years of industrialisation, emphasising the “fluidity” of the mediating spaces. The understanding of the “fluid” characteristic of water/land mediation spaces is relevant for the present. Being dynamic and regularly reinventing spaces, spatial planning, public space, and architectural design processes in “fluid territories” should increasingly seek adaptability, flexibility, and openness to change. In the climatic context of continuous uncertainty combined with the need to make room for infrastructure, rethinking mediation areas through the lens of the theoretical concept of the “fluid territory” enables the implementation of urban transformation processes consistent with contemporary challenges. PB Cogitatio YR 2023 FD 2023-09-06 LK https://hdl.handle.net/10630/31518 UL https://hdl.handle.net/10630/31518 LA eng NO Costa, J., Andrade, M., & Dal Cin, F. (2023). The (Re)Industrialised Waterfront as a “Fluid Territory”: The Case of Lisbon and the Tagus Estuary. Urban Planning, 8(3), 363-375. doi:https://doi.org/10.17645/up.v8i3.6770 NO This work is financed by Portuguese national funds through Fundação para a Ciência e a Tecnologia (FCT) under the strategic project with Reference Nos. UIDB/ 04008/2020 and UIDP/04008/2020. DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 20 ene 2026