Iguaçú , Iguassú (Portuguese) n a river in SE South America, rising in S Brazil and flowing west to join the Paraná River, forming part of the border between Brazil and Argentina. Length: 1200 km (745 miles)
Iguaçú Falls n
a waterfall on the border between Brazil and Argentina, on the Iguaçú River: divided into hundreds of separate falls by forested rocky islands. Width: about 4 km (2.5 miles). Height: 82 m (269 ft.)