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To establish the recharge source of groundwater in the Erenhot wasteland, samples were taken from local precipitation, pumping wells, artesian wells, springs, ponds, and soil profiles in 2015 and analyzed for hydrogen and oxygen stable isotopes. Isotopic results indicate that spring water and soil water in the Erenhot wasteland are recharged by groundwater, which does not originate primarily from local precipitation. Based on isotopic signatures and geological evidences, it is hypothesized that deep circulation of surface water from the northern Tibetan Plateau is the primary source of groundwater within the study area.