Figure 2 | Global overview of inferred key metrics and cross sections of well-characterised vast meteoric groundwater reserves. Data sourced from refs 28, 30, 32, 35–37, 48, 53. The location of each cross-section is indicated by a red line. In the cross-sections, the blue contour linesindicate total dissolved solid (TDS) concentrations (g l−1); distance (km)and elevation (m) relative to mean sea level are indicated along the horizontal and vertical axis, respectively; vertical grey lines indicate well locations where salinity is inferred from water samples and borehole logs;
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