The thirty-metre shape on a calm sea off Awa and Tosa

What the record says

Some years ago, off the border of Awa and Tosa, people saw something about ten jō high, narrow at the top and spreading below, like a great Buddha; there was a place that might have been a head, but it could not be made out. It crossed five or six chō ahead of the boat, and after a while it grew fainter and vanished. The boatman said it was the umi-bōzu, which comes out on clear, windless days and is rarely seen. (From Hio Keizan's Enkyo Zatsuwa, quoting Honchō Zokugenshi.)

Our summary in English of the record as catalogued; the original card is in Japanese.