El guaraní
Groundwater resources supply water to some small urban settlements and small and medium scale irrigation systems in the interior. The most important groundwater reserves in Paraguay in terms of capacity are the Guaraní and the Raigon Aquifer. The Guarani aquifer is one of the largest groundwater reserves in the world, covering 1,200,000 km2 throughout Brazil, Argentina, Paraguay and Uruguay. The Guarani Aquifer has a storage capacity of 40,000 cubic kilometers. With an estimated annual recharge rate of 160–250 km3 and more than 40 km3 available for consumption, the Guaraní aquifer could supply daily 300 liters of water per capita to 360 million people.