The Sanzu River (三途の川 Sanzu-no-kawa), or River of Three Crossings, is a Japanese Buddhist tradition and religious belief similar to the River Styx. It is believed that on the way to the afterlife, the dead must cross the river, which is why a Japanese funeral includes placing six coins in the deceased's casket.
The Sanzu River is popularly believed to be located in Mount Osore, a suitably desolate and remote region of northern Japan.
Real Sanzu River in Japan 
- in Kanra, Kanra, Gunma (confluence with Shirakura River)
- in Chōnan, Chōsei, Chiba (confluence with Ichinomiya River)
- in Zaō, Katta, Miyagi (confluence with Nigori River)
- in Mutsu, Aomori (drain from Usori Lake)
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