Argentina, Iguazu-50
The Devil's Throat, a U-shaped, 82-meter-high, 150-meter-wide and 700-meter-long (490 by 2300 feet) cataract  This is the most impressive of the 275 falls that make up Iguazu Falls and marks the border between Argentina and Brazil.  Two thirds of the falls are within Argentine territory.  Upon seeing Iguazu, the United States' First Lady Eleanor Roosevelt reportedly exclaimed &quot;Poor Niagara!&quot;
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