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Isonade

Last reviewed Oct 25, 2026 Next review Nov 9, 2026

Painted illustration: giant shark-like sea monster off a rocky Japanese coast, ukiyo-e style — AI rendition based on witness descriptions, not an actual photo.

Isonade (磯撫) from the Ehon Hyaku Monogatari (絵本百物語) — Isonade (磯撫) from the Ehon Hyaku Monogatari (絵本百物語) · Takehara Shunsen (竹原春泉, Japanese) · Public domain (via Wikimedia Commons) · Image source

A huge shark-like sea monster said to live off Matsuura and western Japan.

Folklore Verdict: We treat Isonade as folklore: the record is stories and local reports, with no specimen or verified photo.

Region: Oceans · Japan
First reports: Japanese folklore

Key sightings

Our source places it in Japan.

Best evidence

Stories and tradition only; no physical evidence.

Sources

Wikipedia: Isonade ↗