Can other depressions in this region, besides the much-discussed Wadi Rayan, be considered possible of utilization in connection with irrigation or drainage of the Nile Delta?By the 19305 the papers grew even more modest. “I should like to add a few remarks on some of the points raised in the interesting discussion on the ‘Prehistoric Geography of Kharga Oasis.’ “ By the mid-19305 the lost oasis of Zerzura was found by Ladislaus de Almasy and his companions. In 1939 the great decade of Libyan Desert expeditions came to an end, and this vast and silent pocket of the earth became one of the theatres of war.