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The grandest waterfall in the world is not Venezuela’s Angel Falls, at 3,212 feet tall; it’s on the seafloor between Greenland and Iceland, where cold, dense water from the Nordic Seas collides with the lighter, warmer water of the Irminger Sea and plunges over a hidden cataract 11,500 feet down to the seafloor.
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Laura Trethewey (The Deepest Map: The High-Stakes Race to Chart the World's Oceans)