Argentina, Argentine Republic, the Argentine - a republic in southern South America; second largest country in South America

Brasil, Brazil, Federative Republic of Brazil - the largest Latin American country and the largest Portuguese speaking country in the world; located in the central and northeastern part of South America; world's leading coffee exporter

Paraguay, Republic of Paraguay - a landlocked republic in south central South America; achieved independence from Spain in 1811

river - a large natural stream of water (larger than a creek); "the river was navigable for 50 miles"

Guaira, Guaira Falls, Sete Quedas - a great waterfall on the border between Brazil and Paraguay

Urubupunga, Urubupunga Falls - a waterfall in the Parana river in Brazil