River deltas and coastal plains are highly vital environments, offering a wide range of ecosystem services that make them hotspots of biodiversity and human settlement, and key for economic production and food security. Human activities such as river damming, resource extraction and land-use land cover change have significantly altered coastal-deltaic morphodynamics, interact with and accelerate biophysical impacts from climate change. Consequently, these low-elevation environments face increased risks of land subsidence, erosion, relative sea-level rise, flooding and salinity intrusion, all of which impact the functioning of coastal social-ecological systems. These accelerating pressures are promoting key advances in understanding the driving processes, the threats generated and the ways humans are addressing these through management. Developments have come from earth observations using remote sensing, and from modelling, increasingly supported by artificial intelligence, in addition to conceptual advances in critically analyzing the human-coastal wetland relationship from both geoscience and management perspectives, preferably interlinked. Critical research gaps persist, however, regarding all aspects of processes and geomorphic responses to these threats, and these limit our capacity to predict and manage coastal lowland and delta change. A more integrated, multi- and interdisciplinary understanding of the interacting processes and impacts is needed to manage river deltas and coastal plains in a sustainable and inclusive manner. This requires taking a system’s perspective, connecting insights from coastal geomorphology and geology, hydrology and hydrogeology, natural hazards and disaster risk science, as well as human geography and social sciences. This session provides an interdisciplinary platform that welcomes contributions that advance an integrated understanding of the emerging changes, pressures and the interconnected processes and hazards they generate; assess the implications for coping capacity and resilience; explore developments in earth observation and modelling efforts to address them; point out persisting knowledge gaps and identify opportunities for effective management and sustainable development of these coastal lowlands.