Integrated geophysical survey using vertical electrical sounding (VES) and gravity (withrndifferential GPS) methods were conducted to investigate groundwater potential zones andrngeological structures at Gelchet area, Borena zone, South Ethiopia. The main objectives of thisrnstudy were to map groundwater potential zones and determine depth to the basement.rnGeologically, the area is located within the Cenozoic volcanic plain that followed byrnPrecambrian crystalline basement rocks to the southeast of main Ethiopian rift.rnThe data acquired from twenty eight (28) VES points using Schlumberger electrode array withrnmaximum half current electrode spacing (AB/2=1000m) and 115 gravity points (supported byrnhigh accuracy height control from GPS method) were interpreted both qualitatively andrnquantitatively in order to understand the local geology and identify aquifer bearing horizons.rnThe qualitative analysis of VES data were performed by using pseudodepth sections andrndifferent apparent resistivity maps. Similarly, the qualitative interpretations of gravity data werernperformed by using gravity profile plots and different gravity anomaly maps. Finally, thernoverall qualitative interpretation was done by integrating all the above results together with therngeologic , topographic maps and borehole information. As a result of this, geologic structuresrnand groundwater potential zones are identified and drilling sites are recommended.rnThe quantitative interpretations of the VES data were conducted by modeling the VES datarnusing Resix-Ip and WinResist modeling softwares and constructing geoelectric sections alongrnselected survey lines, using the result from individual VES point interpretations. The depth andrnlithologic units from the boreholes were used to fix parameters during the modeling of VESrndata. The information from the VES data and the boreholes were used to constrain the depthrninformation in the gravity modeling which were conducted on two survey lines. The VESrnresults of the data revealed four main geoelectric layers which differ in degree of weathering,rnfracturing, composition and depth of burial. The geoelectric sections enabled to identify thernoverburden thickness and the depth to the aquifer along survey lines whereas the gravity modelrnhelped to identify basement undulation in places where there is no VES data. Moreover, thernvertical electrical sounding survey helped to identify groundwater potential areas and determinernthe depth to the aquifer whereas the gravity survey helped to map the basement topography andrnidentify places having high groundwater reservoir potential