This is a study with possible implications for future growth. The coastal area around Senegal has an interesting combination of high productivity and lower depths to groundwater:

"Here we present the first quantitative continent-wide maps of aquifer storage and potential borehole yields in Africa based on an extensive review of available maps, publications and data. We estimate total groundwater storage in Africa to be 0.66 million km3 (0.36–1.75 million km3). Not all of this groundwater storage is available for abstraction, but the estimated volume is more than 100 times estimates of annual renewable freshwater resources on Africa. Groundwater resources are unevenly distributed: the largest groundwater volumes are found in the large sedimentary aquifers in the North African countries Libya, Algeria, Egypt and Sudan. "

And as noted in NY Times:

This water holds enormous potential to help people and nations move out of poverty, produce more food and better adapt to climate change. But it also could lead to tensions between neighboring countries.





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