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Environmental Protection and Sustainable Integrated Management of the Guarani Aquifer

Project Summary

The main objective of the proposed initiative would be to support Brazil, Argentina, Paraguay and Uruguay in jointly elaborating and implementing a common institutional framework for managing and preserving the Guarani Aquifer for current and future generations. The Guarani Aquifer, named in honor of the Guarani Indian Nation, is one of the largest groundwater reservoirs in the world, and was only recently recognized as one interconnected system, extending through the four MERCOSUR countries for a total of 1.2 million km2. Total reserves would be enough to supply the entire population of Brazil for 3,500 years.The project would be of a preventive nature and would include interventions regerding expansion and consolidation of the current knowledge base, creation of collaborative management framework, information for public participation, and monitoring and evaluation. Given the susceptibility of groundwater resources to pollution and the quasi irreversibility of polluted groundwater sources, a management mechanism that would prevent pollution would yield socio-economic and environemental benefits, both at a local and regional transboundary scale.

Project Details

GEF Project ID
Project Type
Full-size Project
Focal Areas
Funding Source
GEF Trust Fund
Implementing Agencies
The World Bank
Executing Agencies
Organization of American States (OAS)
GEF Period:
GEF - 2
Approval Fiscal Year:


Project Preparation Grant Amount
542,600 USD
GEF Project Grant
13,400,000 USD
Co-financing Total
13,359,800 USD
GEF Agency Fees
1,900,000 USD
Total Cost 27,302,400.00 USD

Project Timeline

Received by GEF
12 Jan 2001
Preparation Grant Approved
26 Jan 2001
Concept Approved
01 Dec 2001
Project Approved for Implementation
30 Apr 2002
Project closed
17 Jul 2009