Guaira Falls

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The Guaíra Falls (also known as Sete Quedas) was at one time considered the largest waterfall on earth in terms of sheer water volume, by some who attempt to keep track of such things. In reality it is hard to judge due to seasonal variations in water flow, but certainly Sete Quedas was once one of the most significant waterfalls in the world. The water volume was reported in some sources to be about 30 times that of the more famous Iguaçu Falls further south.

Upon completion of the 12,600 megawatt Itaipú hydroelectric dam, the falls were submerged beneath the vast lake created by the dam.