The lower Cretaceous Kurnub group in the Beersheba region of southern Israel grades northwestward down the regional slope from thick continental sandstones to marine limestones, thinner sandstones, shale, and marl, with complex interbedding of facies. The principal sandstone beds, although thinning northwestward, are continuous, and they carry ground water from their outcrops in the northern Negev anticlines in the southeastern part of the region to the Mediterranean on the northwest and to a lesser extent to the Dead Sea nearby on the northeast. The regional slope is interrupted by numerous anticlinal and synclinal flexures, some of which were drilled and found water-bearing. Oil and gas accumulations may exist in stratigraphic and hydrodynamic traps where favorable combinations of structure, facies change, and hydrodynamic fluid flow occur. An arched up-dip wedge of a potential reservoir rock coupled with a down-dip flow of reservoir water is particularly favorable. Under such conditions, the oil and gas shows with water in test wells in the region are encouraging.