This index defines one of the primary aquatic domains of Japanese folklore. It documents yōkai and spiritual beings associated with rivers, seas, lakes, wells, and other water environments where life, danger, and the supernatural intersect.
The entities collected here embody humanity’s respect, fear, and dependence on water as both a life-giving and life-taking force. They reflect how Japanese folklore transforms aquatic environments into mythic boundaries between worlds.
This domain forms the aquatic pillar of Japanese folklore, linking river spirits, sea monsters, drowned ghosts, and well entities into a unified folkloric structure.