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This study presents the results of a 3D ERT geophysical survey for sea water intrusion imaging and monitoring at Samaria gorge, Crete, Greece. This survey conducted in the National Park of Samaria gorge during two dry periods, in 2022 and 2023. Dipole-dipole and gradient arrays were chosen to detect both lateral and vertical resistivity variations. The front of sea water intrusion, appeared at 600 and 650 m from the beginning of the scanned lines during the survey of 2023 and 2022, respectively, which corresponds to more than 800m distance from shore.