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The global map of transboundary aquifers (TBAs) shows the surface delineation of aquifers extending over country borders. Such information is necessary to develop appropriate cooperation mechanisms for the management of shared groundwater resources. Yet, it is challenging to map transboundary aquifers due to the invisible nature of groundwater. The current version of the map (2021 edition) is in fact the result of over 20 years of efforts, including regional and global initiatives and projects led by a variety of partners. The main edits brought to the successive editions of the global map of TBAs can be visualized in this viewer.
The Global Groundwater Monitoring Network (GGMN) is a participative, web-based network of networks, set up to improve quality and accessibility of groundwater monitoring information and subsequently our knowledge on the state of groundwater resources. GGMN is a UNESCO programme, implemented by IGRAC and supported by many global and regional partners.
https://doi.org/10.58154/6Z0Y-DA34
The MAR Portal contains the Global MAR Inventory, an inventory of over 1200 sites where Managed Aquifer Recharge is or has been implemented. The Global MAR Inventory includes information on site name, MAR type, year of scheme deployment, the source of infiltration water, the final use of abstracted water, as well as the main objectives of the project. The data shown in this portal have been made available by INOWAS (TU Dresden, Germany and funded by the German Federal Ministry of Education and Research) and the DEMEAU project (European Union FP7 project consortium). More information on the Global MAR Inventory project and its partners can be found or in the following publication: Stefan C. & Ansems N. (2017) Web-based global inventory of managed aquifer recharge applications. Sustain. Water Resour. Manag. https://doi.org/10.1007/s40899-017-0212-6.
If you want to contribute to the Global MAR Inventory, please use the submission form https://www.un-igrac.org/global-mar-inventory-site-submission-form
The MAR Portal also contains a selection of regional MAR suitability maps, showing where MAR could be implemented.
Global groundwater quality maps on probability and occurrence.
The map layer "Arsenic - Probability of Occurrence" is a product of IGRAC from 2004. A report associated with this map is available on IGRAC's website.
The map layer "Fluoride - Probability of Occurrence" is a product of IGRAC from 2004. A report associated with this map is available on IGRAC's website.
The map layer "PFAS Contamination (2023)" is available on IGRAC's platform, and it includes metadata and information about its sources. The primary source of information is mainly shared by Le Monde.
The map layer "Global Arsenic (2020)" is a product of Eawag, and is available on the Groundwater Assessment Platform (GAP). Additional information can be found on their platform.
The map layer "Fluoride - Global Model (2008)" is a product of Eawag, and is available on the Groundwater Assessment Platform (GAP). Additional information can be found on their platform.
The map layers "Saline and Brackish Groundwater Occurrence (Coastal Regions)" and "Saline and Brackish Groundwater Occurrence" are products of IGRAC published in 2012. The associated paper is available on IGRAC's website.
The G3P portal provides the monthly G3P groundwater product at 0.5 degree resolution and as area-average values for selected aquifers worldwide. Please visit www.g3p.eu for more information about the project.
