Abstract: The aim of the study is about beaches in the study area acts like a sponge but the groundwater along the beach is very dynamic. The flow direction of the beach groundwater is mainly governed by the physical and geological characteristics of the beaches as well as the waves and tide conditions in the sea. The Indian Ocean Tsunami 2004 was affected and sediment deposited in the Thoothukudi shoreline. Through the 2D Electrical Resistivity Imaging (ERI) Technique, an attempt is made to understand the interface zone of the seawater intrusion and the land groundwater along the beach groundwater table and Tsunami deposits in the Thoothukudi shoreline. The profiles survey were carried out using the help of equipment like CRM-500, Multicore cable, electrodes and Res 2DINV Software. The measuring profiles are predetermined as a interval of electrodes in m and cm scales. From four profiles study is to determine the salt water and clay tsunami deposit range of apparent resistivity from 1-5 Ω m^-1, sandy 10-100 Ω m^-1.