Bahariya Oases area is located in the northern part of the Western Desert of Egypt It is situated almost 160 km to the west of the Nile Valley. The Bahariya Oases area displays a special importance in recent years due to the discovery of economic iron ore deposits in El- Gedida and Nasser areas as well as the discovery of petroleum in economic quantities in a near-by area.The present book aims essentially to the analysis and interpretation of the areal gamma-ray spectrometric and magnetic survey data recrded over the Bahariya Oases area. These analyses and interpretations are mainly employed to produce geological (lithological and structural) mapping and define mineral exploration potentiality as well as environmental monitoring.