Landslide 3D geometry and hydrology were identified by ERT results. Furthermore, the relationship between electrical resistivity with change in the degree of saturation and landslide hydrology was investigated by completing multiple surveys at the same location, at different times. To determine the most appropriate array, ERT measurements were performed by Wenner-alpha (Wa), Wenner-Schlumberger (WS), and dipole-dipole (DD) arrays. In this study, 2D electrical resistivity tomography (ERT) surveys, geotechnical, and field data are used to define the subsurface structure and the geometry of the Nargeschal landslide. There are various methods used to analyze landslides among these, geotechnical and geophysical methods are widely used due to their accuracy and low cost, respectively. Landslides are natural hazards that cause severe casualties and financial losses.