Do not camp your tent in green oasis. This is the place for scorpions and snakes (as they need water too). The bite of these animals can be treaded with serum but the problem is that the serum should be kept cool in the refrigrator which is not always working so the serum is not good anymore. Also the distance to this serum is mostly a few hours (Luxor, Cairo, Khartoum) which is to long for treatment. So the best place for your tent is in the nice yellow sand !