The Kalu Ganga estuary at Calido beach, Kalutara, Sri Lanka, has experienced significant morphological changes due to both natural processes and human activities. High population density, urban development, and thriving economic activities, particularly tourism, have contributed to its vulnerability. Analysis of changes from 2016 to 2024, using Google Earth imagery and published studies, highlights the influence of seasonal monsoons, sediment transport, tidal flows, river management, and urbanization. Notably, the estuary mouth expanded after the 2017 floods but subsequently narrowed over the years, reflecting the dynamic interplay between natural and anthropogenic factors. To mitigate further changes and promote stability, integrated coastal management strategies are crucial. Sustainable solutions include beach nourishment to counter erosion, mangrove restoration to enhance shoreline stability and biodiversity, and controlled dredging to manage sediment transport. These measures, combined with adaptive management practices, can help balance ecological preservation with the socio-economic benefits of the estuary, addressing the challenges posed by environmental stressors and human interventions.