Iguazu Falls, Argentina/Brazil

Iguazu Falls is a system of 275 individual waterfalls spanning nearly 2.7 kilometres along the Iguazu River on the border of Argentina and Brazil, with the thunderous Garganta del Diablo (Devil's Throat) canyon dropping 82 metres and stretching 150 metres wide at its centre. Average flow is approximately 1,756 cubic metres per second, though floods can push this to 12,000. Eleanor Roosevelt famously remarked "Poor Niagara" upon seeing them. The Argentine side offers closer catwalks above and below the falls; the Brazilian side delivers the iconic panoramic view of the entire horseshoe arc, best photographed from the Trilha das Cataratas at sunrise.