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Photo: Unknown author · Public domain · Wikimedia Commons
Submerged waterfall on the Paraná River in Paraguay and Brazil
The Guairá Falls or Guaíra Falls were a series of immense waterfalls on the Paraná River along the border between Paraguay and Brazil. The falls ceased to exist in 1982 when they were inundated by the impoundment of the Itaipu Dam reservoir. While published figures vary, ranging from 13,000 m3 (470,000 cu ft) per second to 50,000 m3 (1,750,000 cu ft) per second, Guaíra's flow rate was among the greatest of any then-existing falls on Earth.
