In which country is the world's strongest natural whirlpool?

In which country is the world's strongest natural whirlpool is Norway, where Saltstraumen, located near Bodø in northern Norway, is considered world's strongest tidal current and strongest natural whirlpool. Saltstraumen is a small strait connecting outer Saltfjorden to inner Skjerstadfjorden, with tidal currents that create powerful whirlpools up to 10 meters wide when tide changes, with water flowing at up to 40 kilometers per hour, considered strongest tidal current in world, creating massive whirlpools. Saltstraumen is in Nordland county, Norway, near Arctic Circle, and is natural phenomenon caused by 400 million cubic meters of water flowing through narrow strait every six hours with tide. Other strong natural whirlpools include Naruto whirlpools in Japan, in Naruto Strait between Awaji Island and Shikoku, Japan, with whirlpools up to 20 meters wide, considered among largest, and Corryvreckan whirlpool in Scotland, UK, between Jura and Scarba islands, third largest. But world's strongest is considered Saltstraumen in Norway, due to strongest tidal current. So world's strongest natural whirlpool is in Norway, at Saltstraumen near Bodø, Norway, with tidal current creating powerful whirlpools, considered strongest in world, with Naruto in Japan second, Corryvreckan in Scotland third.