— — spirals the tide turns twice a day.
“The narrow strait between Awaji Island and the Shikoku coast, where the Seto Inland Sea meets the Pacific. Twice a day the tides on the two sides fall out of step by more than a metre, and the water pushed through the gap turns into whirlpools that can run twenty metres across. The Ōnaruto Bridge crosses overhead; sightseeing boats from Tokushima ride right to the edge of them. from the studio
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The Naruto whirlpools form in the Naruto Strait, a 1.3-kilometre-wide channel between Awaji Island in Hyōgo Prefecture and the city of Naruto on Shikoku in Tokushima Prefecture. The strait connects the Seto Inland Sea to the Kii Channel and the open Pacific. The surrounding waters are part of Setonaikai National Park, Japan's oldest national park, established in 1934. The Ōnaruto Bridge, a 1,629-metre suspension bridge completed in 1985, crosses the strait and carries the Kobe–Awaji–Naruto Expressway between Honshū and Shikoku.
The whirlpools form because the tide arrives in the Seto Inland Sea and the Kii Channel at different times. Twice a day, the height difference between the two sides of the strait reaches more than 1.5 metres, and the water pushed through the narrow gap accelerates to roughly 13–15 kilometres per hour, among the fastest tidal currents anywhere in the world. The largest spring-tide whirlpools can run about 20 metres across, the largest reported in any sea. They are strongest during the spring and autumn equinoxes, when the tidal range peaks.
Two ways to see the whirlpools up close. From the Tokushima side, the Uzushio Kisen and Naruto Kankōsen sightseeing boats run from the Kameura port in Naruto and ride to the edge of the spirals; a single round trip runs about thirty minutes and costs around 1,800 yen. From overhead, the Uzu-no-Michi walkway under the Ōnaruto Bridge holds a glass-floored observation section 45 metres above the water. Whirlpool intensity is published as a daily tide schedule by the Naruto tourism office; aim for the hours bracketing the spring tide.