Guaira Falls – Located on the Parana River on the border of Brazil and Paraguay. It is the largest waterfall on earth in terms of total volume. On Average 1,750,000 cubic feet of water fell over this beautiful Guaira waterfall each second, compared to just 70,000 cubic feet per second for Niagra Falls. However, the falls were flooded in 1982 when a dam (Itaipu Dam) was created to take benefit of this massive flow rate. The Itaipu Dam is now the second most influential hydroelectric dam in the world, after the Three Gorges Dam. The Itaipu Dam supplies 90% of the power consumed by Paraguay, and 19% of the power expended by Brazil, including Rio de Janeiro and São Paulo.