What is the biggest whirlpool in the world?

What is the biggest whirlpool in the world is generally considered to be Saltstraumen in Norway, which is world's strongest tidal current creating largest and most powerful whirlpools, though Naruto whirlpools in Japan are also considered among biggest. Saltstraumen is located near Bodø in Nordland county, Norway, in a narrow strait connecting outer Saltfjorden to inner Skjerstadfjorden, where 400 million cubic meters of water flow through every six hours with tide change, creating tidal currents up to 40 kilometers per hour and whirlpools up to 10 meters in diameter and 5 meters deep, considered strongest tidal current and biggest whirlpool system in world. Naruto whirlpools, located in Naruto Strait between Awaji Island and Shikoku, Japan, create whirlpools up to 20 meters in diameter, considered largest in diameter, caused by tidal currents between Seto Inland Sea and Pacific Ocean. Corryvreckan whirlpool in Scotland, UK, between Jura and Scarba islands, is third largest, up to 15 meters wide. So biggest whirlpool in world is Saltstraumen in Norway for strongest current and most powerful, with Naruto in Japan for largest diameter at 20 meters, both considered biggest depending on criteria of strength versus size, with Saltstraumen generally cited as world's strongest and biggest whirlpool system due to massive water flow and power.