Abstract: Vertical Electrical Soundings (VES) were carried out in the Chah-Hashem plain in southeast Iran for evaluating hydro-geological and structural conditions of subsurface sequences to a depth of around 250 m below ground surface. Utilizing the Schlumberger configuration, 400 vertical electrical soundings in 7 profiles were conducted in this area. The lengths of current electrode spacing (AB) ranging from 600 to 1000 m. Interpretation of these soundings indicates the presence of an unconfined aquifer that consists mainly of an alluvial aquifer. Zones with high yield potential have been determined as best locations for drilling for exploitations wells based on the resistivity data. On the whole, Chah-Hashem aquifer is an unconfined aquifer with average thickness of 65 m, noticeable extent and suitable quality.