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https://ccgm.org/136-207-thickbox_leoshoe/carte-mondiale-des-ressources-en-eaux-souterraines-.jpg View full size

Groundwater resources map of the World

Scale: 1:40 000 000
Dimensions : 104 x 84 cm
Map only available folded
©BRG Hannover / UNESCO Paris, 2008

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This Groundwater Resources Map of the World at the scale of 1: 40 000 000 is a result of WHYMAP, a joint programme of the United Nations Educational, Scientific and Cultural Organization (UNESCO), the Commission for the Geological Map of the World (CGMW), the International Association of Hydrogeologists (IAH), the International Atomic Energy Agency (IAEA) and the German Federal Institute for Geosciences and Natural Resources (BGR). This map combines the related data known or published so far, showing various characteristic groundwater environments in their areal extent:

  • blue colour is used for large and rather uniform groundwater basins (aquifers and aquifer systems usually in large sedimentary basins that may offer good conditions for groundwater exploitation);
  • green colour areas have complex hydrogeological structure (with highly productive aquifers in heterogeneous folded or faulted regions in close vicinity to non-aquifers), and
  • brown colour symbolises regions with limited groundwater resources ln local and shallow aquifers.


The global Groundwater Resources Map contains only selected information related to groundwater. For reasons of clarity and readability important complementary information has been deferred to a set of four insert maps at the scale of 1:120 000 000). These thematic maps highlight the issues of "Mean Annual Precipitation", "River Basins and Mean Annual River Discharge", "Population Density" and "Groundwater Recharge per Capita".

WHYMAP is a programme implemented by a consortium including UNESCO, the Commission for the Geological Map of the World (CGMW), the International Association of Hydrogeologists (IAH), the International Atomic Energy Agency  (IAEA) and the German  Federal Institute for Geosciences and Natural Resources (BGR). Under  the framework of the UNESCO IHP programme a large number of experts  from different regions of the world have contributed to the WHYMAP  programme. It aims at collecting, collating and visualizing hydrogeological information on a global scale. This project is intended to convey  groundwater-related data in an appropriate way to support global discussion of water  issues, and to raise awareness of underground water  resources that are not directly visible. The products generated by the programme are compiled using  data on groundwater from national, regional and global sources,  and provide information on the quantity, quality and vulnerability of the Earth’s groundwater resources.

See also: www.whymap.org

Map prepared by : Wilhelm Struckmeier and Andrea Richts (Chief Editors), lan Acworth, Giuseppe Arduino, Emilia Bocanegra, Philip Commander, William Cunningham, Petra Dôll, Abdallah Droubi, Nelson da Franca, Wilfried Gilbrich, Jan Girman, Jac van der Gun, Jean Margat, Dominique Poitrinal, Shaminder Puri, Alfonso Rivera, Mohamed Safar-Zitoun, Siavek Vasak, Jaroslav Vrba, Peter Winter, Markus Zaepke, Han Zaisheng and Igor Zektser.

  • Length 84 cm
  • Width 104 cm
  • Weight 0.100
  • Scale 1:40 000 000