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This is going to be very broken but it's something I thought about.
里 I believe is used for Ougon no Sato. Rosa in arc 5 mentions how because it can also be pronounced "Kyo" it made her think about Kyoto. However Kyo as in Kyoto is another kanji 京.
Now one possible thing the "river" could refer to, I believe is the Tokaido road. If you follow it "downstream" you will find a "village" (里) but what if this is the hint Rosa meant? That we need to look for a 京 instead of a 里? Because at the end of the Tokaido is the Osaka Kaido, aslo called Kyokaido (using 京).
This is probably all wrong but I thought I might as well share that idea nontheless.
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