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For more than two millennia now, an astonishing event has regularly manifested off the coast of Norway. Four times each and every day, a set of vortices open up in the waters of the county of Nordland. And according to experts, this phenomenon is the most powerful occurrence of its kind.

Image: Frankemann

A little over six miles away from the Nordland region known as Bodø, a strait called Saltstraumen lies between two fjords. These are called Saltfjorden and Skjerstad Fjord. In simple terms, a fjord is a slim section of water, formed by a glacier, which is wedged between cliffs.

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