Archive - Iguassu Waterfalls
September 18, 2025
This EPOD was originally published September 21, 2010
Photographer: Mike Passow
Summary Authors: Mike Passow; Jim Foster
The photo above shows a close-up view of the impressive Iguassu Falls on the border of Brazil and Argentina. These amazing falls occur where the Iguassu River, approximately two miles (3 km) wide at the point of the falls, plunges over basalt cliffs, some of which are 260 feet (80 m) high. The basalt cap rocks formed over 100 million years ago. Iguassu Falls is one of the widest falls in the world. Actually, hundreds of separate cataracts spread across the Iguassu River. Spotting a rainbow in the vicinity of a waterfall is easy work when the weather is sunny -- just make sure your back is to the Sun. Note also the faint secondary bow. Photo taken on August 11, 2010.
Photo Details: Camera: OLYMPUS IMAGING CORP, uT6000, ST6000; Focal Length: 5.0mm (35mm equivalent: 28mm); Aperture: f/5.0; Exposure Time: 0.0063 s (1/160); ISO equiv: 50.
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