The Naruto whirlpools are among the few in the world capable of reaching a diameter of up to 20 meters.
The Onaruto Bridge was constructed with a two-tier design, specifically to allow for the future installation of a railway track that was never completed, which now houses the walkway.
The whirlpools are caused by the elevation difference of up to 1.5 meters between the Seto Inland Sea and the Kii Channel during spring tides.
The glass floor panels are made of reinforced tempered glass designed to support significant foot traffic while maintaining transparency.
The currents in the Naruto Strait are considered among the fastest in Japan, often cited as one of the three largest tidal currents globally.
The Uzu-no-Michi Walkway is an enclosed promenade suspended 45 meters above the sea within the lower structure of the Onaruto Bridge. The facility features glass-floored sections that provide a direct, downward view of the Naruto whirlpools formed by the tidal exchange between the Kii Channel and the Seto Inland Sea. The walkway spans 450 meters in length, leading to an observation room at the bridge's mid-point. These whirlpools occur due to the complex geography and rapid water currents reaching speeds of up to 20 kilometers per hour. The facility is located within the boundaries of Naruto Park. It serves as an engineering observation point, offering insights into the suspension bridge's support structure alongside the maritime phenomenon.
The glass floor panels in the observation room provide the most distinct vertical perspective of the swirling water below.
Check the daily tide tables before your visit, as the whirlpools are only visible during specific tidal changes.
Bring a pair of binoculars to observe the whirlpool activity, as the height of the bridge can make the details difficult to see with the naked eye.
Combine your visit with a boat tour departing from the nearby coast for a different perspective of the currents.
Visiting during slack tide, when the water is calm and no whirlpools are visible.
Closed on the second Wednesday of March, June, September, and December.
