The Sanzu River Serpent (三途の川の大蛇 Sanzu-no-Kawa-no-Daija) was the giant serpent lived in the blood river of Jigoku. Nezumi-Otoko called it Daija-Sama (大蛇様, Lord Serpent).
The Sanzu River Serpent is a large snake with slit pupils, sharp fangs, and a long body. The serpent notably has long hair on its head, similar to many other Jigoku serpents. In the 1985 anime, it has green scales, pink sclerae, and blue hair.
The serpent has an aggressive personality, being rather bloodthirsty and voracious.
After it devoured Kitarō, it was shortly melted down to its skeleton by his stomach acids.
When it was stabbed by Kitarō's Yōkai Ocarina, its body faded and disappeared.
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