National Geographic : 1943 Oct
Through Paraguay and Southern Matto Grosso 485 Sir (hristopher H. Gibson Sightseers Warily Cross Guayra, by Volume the World's Most Stupendous Waterfall Visible are two of the 18 vents through which the Parana cascades a maximum 130 feet. A precipice three miles broad narrows into a gorge less than 300 feet from wall to wall. There a thundering torrent, racing 20 miles per hour, whips huge waves into rainbow spray. At extreme flood Guayra has eight and one-third times Niagara's volume. Paraguay and Brazil share this wonder, as Argentina and Brazil share the spectacular beauty of the more familiar Iguassu Falls (page 487).