Japan
Whirlpools twenty metres across spinning beneath a bridge where two seas collide.
The water spins. Roughly every six hours, as the tide turns between Pacific and Inland Sea, whirlpools up to twenty metres wide open beneath the Ōnaruto Bridge. Naruto, in Japan's Tokushima Prefecture, sits at the choke point where a difference of up to a metre and a half in sea level tries to equalise through a strait barely a kilometre wide. The result is hydrodynamics performed at spectacle scale.
The Naruto whirlpools are said to be the biggest anywhere. They form where fast and slow tidal streams meet over a strangely shaped seabed, and they are at their biggest on the spring tides of late March and April, when the water runs hardest. The Uzu no Michi walkway hangs beneath the bridge with glass floor panels 45 metres above the water, and sightseeing boats run straight into the whirlpool zone — one of them with windows a metre below the waterline, another close enough to get you wet. Nearby, the Ōtsuka Museum of Art fills a mountain with full-size ceramic reproductions of Western masterpieces, the Sistine Chapel ceiling among them, and Naruto is also the first stop on the Shikoku pilgrimage.
Family
Children stare at the whirlpools open-mouthed — from the glass floor above or the boat below. The museum's scale impresses every age.
Friends
The boat trip out to the whirlpool zone is a group experience by nature — spray, shouting, and the collective thrill of water moving faster than it should.
Couple
The bridge walkway at the turn of the tide, the museum's ceramic Sistine Chapel, and the drama of the whirlpools carry a day from contemplative to exhilarating.
Naruto wakame, the seaweed grown in the strait's racing current, firm and rich even after cooking.
Naruto kintoki sweet potatoes roasted until the sugar caramelises through the skin, an autumn stall staple.

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