Seawater intrusion affects the sustainability of coastal aquifers, particularly in arid regions such as Eastern Saudi Arabia, where groundwater is the primary source of water. This study maps and characterizes seawater intrusion in Al-Hofuf area using Vertical Electrical Sounding (VES) with a Schlumberger array at 20 sites along a coastal-inland transect (AB/2 up to 400 m). Resistivity data were inverted through 1D modeling and statistically validated (R-2 > 0.97), revealing four geoelectric layers. The upper heterogeneous Quaternary sediments exhibited variable resistivity, while a low-resistivity clay-rich layer (3.4-39 Omega m) acted as an aquitard. The underlying fractured and karstified limestone (12.2-132 Omega m) forms the principal freshwater aquifer. Very low resistivity (<10 Omega m) near the coast (VES-20, VES-16, VES-10) indicated active intrusion, whereas inland points (VES-7, VES-8) showed high resistivity, denoting fresh or dry sands. Spatial analysis revealed an intrusion extending up to 35 km inland, along permeable sands and fractured limestone. Structural geology, particularly north-south trending anticlines and synclines, modulates saline migration, acting as partial flow barriers. Integrating geoelectrical results with structural mapping produced the first high-resolution seawater intrusion model for Al-Hofuf, identifying vulnerable zones and potential sites for Managed Aquifer Recharge (MAR). This cost-effective and scalable approach supports sustainable groundwater management in arid coastal environments, aligning with Sustainable Development Goal 6.