The study aims to describe and give some detailed picture on the Hydrogeological featuresrnof the Hormat- Golina basin with more focus on the flat areas of the Kobo valley. Thisrnmakes an interest from the groundwater potential point of view to evaluate its waterrnresource potential on the basis of aquifer characterization, recharge mechanism,rngroundwater flow conditions and hydrochemistry of the groundwater. The basin is part ofrnthe western escarpment of Afar Rift and measures about 806 km2 areas. It is situatedrnbetween 545000 to 581000m East longitude and 1315000 to 1351000m North latitude withrnan average elevation of 1482m.a.s.l and 2605m.a.s.l for the valley and highland part ofrnbasin, respectively. The average monthly temperature and the mean annual precipitation inrnthe valley are 22.40C and 739mm, respectively. Potential evapotranspiration (PET) of thernvalley was estimated using Penman Combination method which gives annual PET value ofrn1596.1mm/y. Actual evapotranspiration value for the catchment estimated from Turcrnmethod gives value of 655mm. The annual surface water out flow, estimated using runoffrncoefficient methods resulted 98.4MCM. Chloride mass balance (CMB) method, Darcy andrnconventional water balance approaches were used to estimate recharge, while the averagernof the three values is taken as the annual recharge of the area (44.8MCM/year) which isrn6.4% of the total precipitation and groundwater reserve of the valley is estimated asrn2033MCM. To characterize the aquifer system of the area pumping test data, wellrncompletion reports, well logs and geology of the area were analyzed. The study area isrncharacterized by deep groundwater systems encountered at an average depth of 141m.rnTheir hydraulic characteristics are spatially variable, which the transmissivity of the valleyrnranges from 6.85 â€“ 4510 m2/d and the mean, and median are 492.38 m2/d, and 199m2/d,rnrespectively. Its hydraulic conductivity ranges from 0.19 â€“ 125 m/d and the mean, andrnmedian are 10.9 m/d, and 4.25m/d, respectively. The Quaternary unconsolidated sedimentsrnare the main aquifer units in the area. These aquifers were found to be good groundwaterrnpotential zone. The general trend for groundwater flow observed from pieziometric headsrnis from western highland part of the area towards the plain in the direction of west to eastrnof the study area. Piper plots, Collins bar diagram and Hierarchical cluster Analysisrn(HCA) were used to classify the water chemistry. Groundwater type of the area wasrnevolved from Ca-Mg-HCO3 or Mg-Ca-HCO3 water type in the area closer to westernrnescarpment in to Na-Ca-HCO3 water type in the eastern tip of the area. The water alsornwas of a low sodium hazard and can therefore be used for irrigation without posing muchrnrisk to the compaction of soils.rnKey word: Kobo valley, groundwater potential, recharges estimation, hydrochemistry