If you thought that one of the biggest and longest waterfalls was Niagara Falls you would be wrong. Most likely you haven’t heard about the Denmark Strait. One of the reasons is probably because this waterfall is below the surface in the Atlantic Ocean.
This waterfall is equivalent to 2000 of the world’s most notable waterfalls. Water cascading from it goes 11,500 feet straight down. Denmark Strait’s cold water on the eastern side is denser than the warmer water flowing from the west side. As a result when these two waters come together, the colder one sinks and a waterfall forms.