<p>Assessing the level of seawater intrusion into aquifers along the coast is a critical issue in managing groundwater resources. The GALDIT model is appropriate for mapping and assessing the susceptibility of seawater intrusion through the assessment of several parameters using systematic GIS techniques. Seawater intrusion (SWI) must be effectively diagnosed in order to permit the sustainable use of groundwater resources in coastal regions. The existing GALDIT was divided into two categories to estimate the degree of vulnerability to seawater intrusion: dynamic (height to groundwater level above sea level; L), stable (occurrence of groundwater; G), aquifer hydraulic conductivity (A), and distance from the coast (D). The groundwater quality index for seawater intrusion (GQI_SWI), the study region, geostatistics, and a new vulnerability mapping method GIS and the Herzberg model were both developed. The groundwater contamination trend in the coastal aquifer due to seawater intrusion is ascertained through the use of the model. The suggested approach can be used to develop a water resource management plan that protects vulnerable coastal areas and takes into consideration the seasons that are more likely to cause harm. In coastal areas, there is an extremely high vulnerability zone to saltwater intrusion. The covered area percentages were as follows: 27.07% are low, 34.41% are medium, 28.4% are high, and 10.11% are very high. As a result, in order to mitigate the impact of saltwater, fresh groundwater sustainability management strategies must be implemented. According to the vulnerability assessment, significant attention must be paid to coastal environment planning and adaptation to catastrophic events in order to ensure the safety and well-being of coastal people and the framework.</p>