||Hydrogeology study was done to investigate and map potential groundwater aquifers in Somaliland and Puntland, to create a base for efficient and sustainable groundwater use. The study comprised of four parts:- Remotes sensing analysis of satellite images; Desk study and review of previous investigations; Field survey; and Analysis of collected hydrogeological and geophysical data including water quality testing and finally collation of all results into maps and reports. A regional hydrogeology map at 1:750 000 scale, and at four detailed maps at scale 1:250 000 for selected promising sites covering an area of approximately 46,000 km2 were produced. Through the field survey, 720 water sources were visited and data collected on different parameters. Samples from five hundred and ten (510) water sources were collected and analyzed in a specialized laboratory for common compounds and heavy metals. The findings of the study were published in a technical Report No. W-12.