https://www.landearth.co.jp/en/ is the First company to bring white water rafting to this river and they are still the best for Canyoning and White water Rafting. Land Earth is the company name. We did the one day trip where you go Canyoning in the morning, have lunch back at the office and then go white water rafting in the afternoon. Great day , great plan,, a really good time . Check them out, Ask for Jack as your guide too !
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https://www.youtube.com/watch?v=Yq6zeL0lxuc