<p>Solid waste management remains a critical environmental challenge in developing countries, where recycling efforts are limited, and waste disposal relies heavily on incineration and landfilling. Proper landfill site selection is vital to ensure environmental sustainability and adherence to strict regulations. This study integrates geospatial analysis and geophysical surveys to identify the most suitable landfill site in Port Said, Egypt. Eleven environmental parameters, based on the Environmental Protection Agency (EPA) criteria, were evaluated using a multi-criteria decision analysis (MCDA) within a Geographic Information System (GIS) platform. Parameters were weighted according to their significance, and an additive weighting method was applied to generate suitability maps. Electrical resistivity surveys were conducted to analyze candidate sites’ geological and hydrogeological conditions. Among the three potential locations, a site in the eastern part of Port Said was identified as the most suitable due to sufficient space and favorable groundwater depth. This study highlights the importance of integrating geospatial and geophysical approaches for landfill site selection, particularly in sensitive ecosystems. The findings provide essential data for decision-makers to enhance waste management practices, safeguard ecological integrity, and protect public health in environmentally sensitive regions like Port Said.</p>