The Collaborative International Dictionary of English v.0.48:
Guaira \Guaira\ prop. n. a great waterfall on the Brazil-Paraguay border. Syn: Sete Quedas, Guaira Falls. [WordNet 1.5]WordNet (r) 3.0 (2006):
Guaira n 1: a great waterfall on the border between Brazil and Paraguay [syn: Sete Quedas, Guaira, Guaira Falls]