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満潮、もしくは干潮時刻に大きなうず潮が見られます。これは、満潮時に太平洋から瀬戸内海へと海水が流れ込み、干潮時に瀬戸内海から太平洋へと海水が流れ出る際、狭くなった鳴門海峡を大量の海水が流れて渦が巻くからです。なので、満潮と干潮のちょうど間の時間帯だと、太平洋と瀬戸内海との間で潮流が止まってしまって、渦は巻きません。潮見表を確認してみましょう。
また、大潮（満月、新月）であれば、月と地球と太陽が一直線に並んで潮の満ち引きが特に大きくなるため、うず潮も特大になります。
天気は関係ないので、雨でもうず潮は見られます。
Check the whirlpool timing
Large whirlpools can be observed at high tide or low tide. This occurs because, at high tide, seawater flows from the Pacific Ocean into the Seto Inland Sea, and at low tide, seawater flows out from the Seto Inland Sea back into the Pacific Ocean. As vast quantities of seawater flow through the narrow Naruto Channel during these times, it swirls into whirlpools. Therefore, during the period precisely between high tide and low tide, the tidal currents between the Pacific Ocean and the Seto Inland Sea cease, and no whirlpools form. Please check the tide tables.
Moreover, during spring tides (full moon or new moon), when the moon, Earth and sun align in a straight line, the tidal range becomes exceptionally large, resulting in particularly massive whirlpools.
The weather does not affect this, so whirlpools can be seen even in the rain.
橋より観潮船
うず潮を橋の上から510円と安価で見られますが、2,000円を払って観潮船から見たほうが断然おすすめです。観潮船にも何種類かあって、その中でもおすすめなのはうずしお汽船です。うずしお汽船の観潮船は小型なので海面からの距離が近く、大迫力のうず潮を目の前で楽しむことができます。
乗船の事前予約はできません。
ちなみに、観潮船がうず潮に吸い込まれてしまうことはありませんので、ご安心を。
Take a small boat
Whilst the whirlpools can be viewed reasonably from the bridge for ¥510, paying ¥2,000 to see them from a tide-viewing boat is far more recommended. There are several types of boats, and among these, the Uzushio Kisen is highly recommended. The Uzushio Kisen’s boat is small, so they operate closer to the water surface, allowing you to enjoy the spectacular whirlpools right before your eyes.
Bookings are not accepted.
By the way, the whirlpool NEVER sucks the boat into the sea. Don’t worry😉
鳴門駅からバスで20分
うずしお汽船の観潮船に乗る港からの最寄りバス停「亀浦口」までは、JR鳴門駅から路線バスで20分かかります。
20 minutes by bus from JR Naruto
The nearest bus stop to the port where you board the Uzushio Kisen tide-viewing boat, “Kameuraguchi”, is a 20-minute journey by local bus from JR Naruto Station.
UPDATED 29th January 2026
