Folklore, retold
The story as it is told
A retelling, not a citation. What follows is the story as the most widely circulated popular accounts tell it — folklore encyclopedias, translations, and the versions that have travelled furthest. It is synthesized rather than keyed line by line to the dated primary texts, and popular versions drift from what those texts actually say. The cited, source-by-source record begins further down this page, and where the two disagree, the record wins.
The Kiso River, in storm.
And from upstream, over the rain, a voice.
> Yaroka, yaroka. > > *Shall I give it? Shall I give it?*
And if anyone answers —
> Yokosaba yokose. > > *If you're giving, hand it over.*
— the flood comes at once, and the village drowns.
The flood is polite
That's the thing to sit with.
It asks.
It announces itself, it waits, and it requires an answer — and one person's bravado, shouted into the rain, signs for everybody.
Some tellings add red eyes and mouths on the surface of the water, which is the version I'd leave out of the illustration. The voice is enough.
And it is attached to real floods, with dates
This is what lifts the yaroka-mizu out of the folklore shelf.
Keian 3 — 1650. The flood that destroyed Kamihannya village in Niwa district. More than three thousand deaths recorded in the Ōgaki domain area.
And witnesses reported the voice again in 1687, and in 1873.
Three date-stamped hearings, and a body count in the archives.
The naturalist reading is not a debunking
The proposals: boulder-rumble as flood erosion moves the riverbed. Storm wind. Or the sound-front of a debris flow — which is a real and documented phenomenon and does arrive ahead of the water.
And the assessment attached: the legend likely served as a community warning system.
Which is exactly right, and it makes the folklore better rather than smaller.
Because look at what the rule actually does
It makes answering strange sounds during storms taboo.
Which means it keeps people away from the river at surge time.
A young man who hears something odd upstream in heavy rain has two options. He can go down to the bank and shout back to find out what it is — which is precisely what a curious person does, and precisely where you do not want to be standing.
Or he can remember that answering is how the village drowned in 1650, and stay where he is.
Folk engineering, dressed as a ghost story, and it works on the exact behaviour that gets people killed.
It's the protocol doctrine at civilizational stakes
Every night-creature in this tradition teaches the same grammar: the thing announces itself, and your response determines the outcome.
Say I've seen through you and the monk collapses. Say please, go on ahead and the footsteps pass. Hand over a bottomless ladle. Answer the shout. Don't answer the shout.
The yaroka-mizu applies that grammar to hydrology.
And where most of these rules protect one traveller, this one protects a village — and the record shows what it cost the times it failed.
No monster figure, if you illustrate it. The river is the figure.
Field guide
At a glance
- Behavior
- Calls from upstream in storms — "shall I give it?" — and delivers the flood only if answered.
- Powers
- The flood itself; three date-stamped appearances (1650, 1687, 1873) with deaths in the domain records.
- Weaknesses
- Silence. Never answer strange sounds during storms.
- Oddities
- The rare yokai with a body count in the archives.
- Folk engineering: the taboo on answering keeps people away from the river at surge time — a warning system wearing a voice.
Overview
The Kiso River in storm. From upstream, over the rain, a voice: "Yaroka, yaroka" — shall I give it? shall I give it? If anyone answers "Yokosaba yokose" — if you're giving, hand it over — the flood comes at once and drowns the village [ja-yaroka]. Some tellings add "red eyes and mouths on the water's surface" [ja-yaroka].
The record
- The dated anchor: the legend attaches to real disasters — the Keian 3 (1650) flood that destroyed Kamihannya village (Niwa district) with 3,000+ deaths recorded in the Ōgaki domain area; witnesses reported the voice again in 1687 and 1873 [ja-yaroka].
- The naturalist reading: boulder-rumble in flood erosion, storm wind, or the sound-front of a debris flow — "the legend likely served as a community warning system" [ja-yaroka].
The reading
The tradition's protocol-doctrine at civilizational stakes. Every night-yokai teaches the same grammar — the thing announces itself, and your response determines the outcome — and the yaroka-mizu applies it to hydrology: the flood is polite; it asks; and one fool's bravado ("hand it over!") signs for the whole village. As folk engineering it's brilliant — a rule that makes answering strange sounds during storms taboo is a rule that keeps people away from the river at surge time. File beside the Gunma azukibabaa's unresolved "or" — but where her question hangs forever, this one has three date-stamped answers in the death registers. The authenticity-spectrum should hold it up as disaster-trauma folklore: the rare yokai with a body count in the archives.
Two-track labeling
The image
Citations
The record
- [ja-yaroka]「ヤロカ水」ja.wikipedia via WebFetch (retrieved 2026-07-26), Tier C.modern reference Japanese Wikipedia's article on this subject, as retrieved in 2026 — often carries regional detail the English article lacks.All-source record
Where the evidence thins
Open questions
- Yobuko/answering-voice family entry (the yama-response class) — cross-link pending.
- The 1650 flood in domain records (secondary source for the places page).