The Naruto whirlpools are a natural phenomenon that is created by the strong tides caused by the differences in ebb and flow between the Seto Inland Sea and the Kii Channel.
They become the biggest during the whirlpool seasons of spring and autumn, with those whirlpools reaching up to 20m in diameter being referred to as the largest in the world.
The tide along the Naruto Strait is known as one of the world’s big three tides, along with Italy’s Messina Strait and Canada’s Seymour Strait.
By boarding a cruise ship, it is possible to see the power of the whirlpools up close.
