The paper gives a first complete view about the isotope hydrological situation in the Schirmacher Oasis and surroundings by means of studies of δ Deuterium and δ Oxygen 18 variations. The precipitation is assumed to be condensed in a distance of about 100 km and in a hight of the surface of the inland ice between 1.000 in and 1.500 m a.s.l. in the mean wind direction South East. The δD value studies of the shelf and inland ice have shown that both the basal zone of the inland ice and the ice shelf represent relics of an assumed thicker late pleistocene ice cap of Dronning Maud Land. The main part of the glacier ice is composed of recent local precipitation. The isotope liydrological studies are also a contribution to the characterisation of the high polar fresh-water lakes, ponds and pools under different limnological conditions.