Fig. 2: Aquifer vulnerability map of the Sahel region of Africa based on using a tritium threshold in groundwater of one-half of that in local precipitation. | Nature Sustainability

Fig. 2: Aquifer vulnerability map of the Sahel region of Africa based on using a tritium threshold in groundwater of one-half of that in local precipitation.

From: Groundwater vulnerability to pollution in Africa’s Sahel region

Fig. 2

The corresponding performance statistics are listed in Supplementary Table 2. The faded, striped areas are outside of the model’s AOA (Methods) and considered less reliable. Stars indicate the national capitals. BN, Benin; GA, The Gambia; GB, Guinea–Bissau; LB, Liberia; SL, Sierra Leone; SS, South Sudan; TG, Togo.

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