In Tokawa, Shimanto-cho, Takaoka-gun, Kochi Prefecture, which is midway along the Shimanto-gawa River, the Kawa-watashi (passing over a river) of 500 koi-nobori takes place from the end of April to the beginning of May, and this place is known as its origin.
四万十川中流の高知県高岡郡四万十町十川では4月下旬から5月上旬にかけて500匹の鯉のぼりの川渡しが行われており、その発祥地として知られる。