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(also Guaira), a series of waterfalls and rapids in the middle course of the Paraná River; located on the border between Brazil and Paraguay. The river drops a total of 117 m as it flows through the falls and rapids; the highest waterfall is 33 m high. The falls are formed at the point where the river flows over the basalt scarp of the Paraná Plateau. The flow rate is approximately 6,000 cu m per sec.