Hydrogeological Structures in Africa

<div>This map shows hydrogeological structures. Large shared aquifer resources often represent the only source of drought security and life sustenance for large population in <span style='line-height: 1.38461538461538;'>semi-arid areas. While the linkages between surface water and groundwater are critical to aquifer recharge, the watersheds in many aquifer recharge zones are threatened by </span><span style='line-height: 1.38461538461538;'>accelerated land degradation and desertificatoin, reduced seepage and in irrigated areas, by water logging and salinization.</span></div><div><span style='line-height: 1.38461538461538;'><br /></span></div><div>Source: <a href='http://www.amcow-online.org/docs/atlas/Summary%20for%20Decision%20Makers%20(English).pdf' style='line-height: 1.38461538461538;' target='_blank'>UNEP 2010</a><br /></div>