but they were flooded by a dam: http://en.wikipedia.org/wiki/Gua%C3%ADra_Falls The Guaíra Falls ( Spanish : Saltos del Guaíra, Portuguese : Salto de Sete Quedas) was a waterfall located on the Paraná River between Brazil and Paraguay . With an estimated volume of 1,750,000 cubic feet (50,000 m3) per second, the falls were,