The first thing that hits you when you get close to the viewing site is how windy it is there...so very windy...breathtakingly so...literally.
It's a few minutes walk along the pedestrian platform under the bridge (links Shikoku to Awaji island) until you get to the best spots to watch the waves and they are quite a sight from directly above. I couldn't summon up the courage to go on one of the boats that go right upto the whirlpools, but I reckon it's probably a better view, if not as exciting as being on a boat.
The website will tell you what time high tide is (twice a day)...it's usually possible to see the whirlpools for 2 hours either side of high tide.
I came by car with friends, but it is possible to do easily by train from Takamatsu or Tokushima.
On my visit it was all Japanese people except for me and the people who worked there were so pleased to see me (and practise their English) I was given free entry and a souvenir postcard :-)
For me, it was a great experience to see something unlike anything else I'd ever seen...even if I did look rather dishevelled when I left.
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