Fig. 1From: Sources of salinity and arsenic in groundwater in southwest BangladeshLocations of drill core and tubewell sampling sites. The red square in the inset map shows the regional location of the larger map. Background is a composite 2012 GeoEye satellite image. Tubewell symbol size is proportional to average measured specific conductivity of groundwater samples collected from each tubewell. The red line is the section to which sampled wells and drill core sites are projected to create the profile in Fig. 2 Back to article page