Coastal ecosystems are multidisciplinary research topics encompassing the structure, function, and dynamics of biological communities and physical environments at the land–sea interface, including salt marshes, mangroves, seagrass meadows, tidal flats, estuaries, rocky shores, and coastal dunes. Scientific study focuses on biogeochemical cycles, primary productivity, trophic interactions, sediment transport, and hydrodynamic forcing (tides, waves, currents) that shape habitat distribution and resilience. Research also examines nutrient loading, contaminant fate, habitat fragmentation, and climate-driven stressors such as sea-level rise, ocean acidification, and warming, often integrating remote sensing, numerical modeling, and long-term ecological monitoring to quantify ecosystem services and assess vulnerability to anthropogenic impacts.