Here's a hint: They're not in Central America.
This morning's Spokesman-Review has an article about the world's largest hydroelectric dams. Grand Coulee is now the fourth largest. But, what made me laugh was the Spokesman's claim that Paraguay and Brazil were in Central America.
Update: After I sent the S-R a teasing e-mail regarding their geographic boo boo, they corrected the graphic that had the Parana River in Central America. It's now back in South America, as God intended.
When I first saw the article's headline, I was shocked. It showed the Itaipu Dam on Central America’s Parana River as the second largest in the world. This shocked me because, although Central America gets plenty of precipitation during its six month rainy season, none of the drainages are big enough to produce enough megawattage to compete on the world stage.
Then, I read on.