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The most difficult rivers of South America riddles

A list of rivers of South America related questions that are most often answered incorrectly
Rivers quiz
Which large river flows through Rio de Janeiro? ("rio" is Portuguese for "river")
Janeiro
La Plata
Corcovado
None
The Portuguese were the Europeans who encountered Guanabara Bay on January 1,1502. They took it for a large river, which they named "Rio de Janeiro" ("January River"). Later it was discovered, that the presumed river was in fact a gulf, but the name remained.
 globalquiz.org
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wikipedia → Rio de Janeiro
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Very interesting!
Rio de Janeiro riddles
The grand Itaipu dam generates power for two countries. Which ones?
Brazil and Paraguay
Argentina and Uruguay
Colombia and Venezuela
Ecuador and Peru
The Itaipu Dam is located on the ParanĂ¡ River between Brazil and Paraguay. It is still the largest dam in terms of annual energy generation, even though its capacity is smaller than Three Gorges Dam. Of the twenty generator units, ten generate at 50 Hz for Paraguay and ten generate at 60 Hz for Brazil.
 stig
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3
Very interesting!
electricity riddles
How tall is Angel Falls, the world's tallest uninterrupted waterfall?
39 m (128 ft)
79 m (259 ft)
179 m (587 ft)
979 m (3,212 ft)
Angel Falls is over twice as tall as the Empire State Building. It is one of Venezuela's top tourist attractions, though a trip to the falls is a complicated affair, as the falls are located in an isolated jungle.
 globalquiz.org
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Venezuela riddles
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