An "underground water reservoir" formed by a "group of sandy rocks below the soils' level with water in its pores and fissures" , it is the "largest aquifer in South America," extending "over 1.2 million square kilometres in Brazil alone—equal to the areas of England, France, and Spain combined" and "already supplies some 15 million people in the region. Best estimates show that the Guarani contains enough water to supply 360 million people on a sustainable basis. Already, some 500 cities and towns across Brazil draw their water from the Guarani," according to the International Atomic Energy Agency. 
"The aquifer underlies nearly 20% of Paraguay, covering a vast landscape of 72,000 square kilometers in the southeastern portion of the country." 
"Uncontrolled exploitation could reduce it from a strategic water reserve to a degraded resource that is a focus of conflict in the region," the IAEA writes. "This is the principal challenge being undertaken by the four national governments together with the Global Environment Facility (GEF), a funding consortium jointly managed" by the United Nations Development Programme (UNDP), United Nations Agency for Environment (UNEP), and the World Bank. 
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- Schematic Map of the Guarani Aquifer System.
- "Guarani Aquifer System," General Secretariat, Guarani Aquifer System Project, Uruguay.
- "Guarani Aquifer System. Environmental Protection and Sustainable Development of the Guarani Aquifer System," Organization of American States.
- "Guarding the Guarani: Improving Management of South America’s Precious Groundwater," International Atomic Energy Agency.
- Guarani Aquifer Project, World Bank.
- "A Framework for Sustainable Conservation Practices in the Guaraní Aquifer of Paraguay," NatureServe.
- Guaraní Aquifer in the Wikipedia.
- André Muggiati, "Four Nations Guard Giant South American Aquifer," Environmental News Service, May 29, 2003.
- Marcela Valente, "Specter of Water War Looms Over Guaraní Aquifer. NGOs denounce an alleged Washington conspiracy to take over South America's Guaraní Aquifer. Officials and experts alike say it is a crazy notion," Tierra America, March 20, 2004.