Watershed delineation and groundwater resources assessment are the most important steps in integrated water resources management planning and sustainability. Long-term water resource planning requires spatial and temporal information on groundwater level, recharge and discharge rates. Over the last few years several researchers tried to delineate Marsaba-Feshcha catchment boundary conditions based on 2-D and 3-D conceptual and mathematical models. Limited success was achieved in delineating Marsaba-Feshach basin boundary, due to hydrogeological, geological and hydropolitical complexity. Up to this moment boundary delineation at Marsaba-Feshcha watershed still undefined and challenging. This study reviled new facts about the hydro geological sitting through using new advanced methods which provided the researchers with new information about the water flow system in this Karstic aquifer. The new data represented in this book should help Environmental planers, geoscientists, hydrochemists, hydrogeologists, geophysicists, catchment molders to understand flow models in Karstic systems.