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The story
The old place name “Yagi Jarakuji Ashidani,” once used in Asaminami Ward, Hiroshima City, has become a hot topic again on 5channel’s Science News board. Read as “Yagi Jarakuji Ashidani,” the name is said to combine the image of a debris flow slithering down a valley like a snake with the meaning of a dangerous, easily-collapsing valley (“Ashidani” = “evil valley”). After a major landslide disaster struck the area in 2014, this place name drew attention as a “warning from our ancestors.” Commenters on the thread were split — some argued old place names should be put to use in disaster prevention, while others pointed out that modern topographic maps and hazard maps are more practical.
Last updated:
12 hours ago
The old place name for the Yagi district in Asaminami Ward, Hiroshima City — “Yagi Jarakuji Ashidani” — conveyed the danger of landslides, and drew renewed attention after the major debris flow disaster of 2014.
Source: x.com / Original article here
What people said
You practically have to pore over old maps just to decide where to live.
Just learn to read a modern topographic map.
Do you even understand the thread title?
Old maps don't show you the actual terrain, and terrain itself sometimes changes between then and now.
Near my place there's a spot where a company quarried the mountain right out of existence.
If you're deciding where to live today, today's terrain is what matters most — modern topographic maps and hazard maps should be your first priority.
Old maps are, at best, a secondary thing to check when something feels off.
This isn't really anything more than a hobby for history buffs.
You'd think you could tell just by looking at the local terrain, without even needing the place name.
'Yagi' (八木) itself isn't a bad meaning — it's a breakdown of the character for 'rice' (米), so if anything it's a positive one.
You can't rule out there was once a hidden rice paddy here, but I'd guess they just used the convenient 'Yagi' because the imagery suggested eight snakes falling from a tree. Just speculating though.
> On its own, 'Yagi' (八木) can mean 'a narrow little valley in the mountains'
> During the Great East Japan Earthquake, a residential area called 'Yagiyama' on the outskirts of Sendai also suffered landslide damage
Beyond 'Yagi':
> The character 梅 ('ume', plum) often derives from 埋め ('ume', meaning 'buried/filled in'), referring to ground buried by past landslides
> 'Sarutahiko shrines' are common in areas prone to ground collapse
> Kanji like 川 (river), 江 (inlet), 橋 (bridge), and 深 (deep) tend to appear in soft-ground areas that shake easily in earthquakes and carry liquefaction risk
> The fact that major stations in big cities sit on soft ground shows up in place names like 'Yaesu' and 'Umeda'
Who's gonna be fine with eight fallen trees coming down the slope at them?
Origin: The name is said to liken a violently rushing debris flow to "a snake falling down," while also carrying the meaning of "Ashidani" (evil valley — an easily-collapsing, dangerous valley), making it a place name believed to warn of a history of past disasters and danger.
Even without the original place name, I think it's enough to remember the ancestors' warning:
don't build a house right at the foot of a mountain or next to a river.
There's one more: the top of a hill — because you're exposed to sun and storms.
Sorry, but I don't get why 'Yagi' would mean 'a narrow little valley in the mountains.'
'Tani' (谷, on-reading: 'ya') +
'kiwa' (edge)
shortened to 'Yagi'
Guess you'd have to rack your brain pretty hard to come up with a pun-based etymology like that.
Time to replace every single cap holder (users with special thread-starting privileges on 5ch).
If you're gonna call yourself the Science News board, at least get your sources straight.
It even creates the threads itself.
https://kes.5ch.io/newsbot/
— Dai-ichi Life (playing on the insurance company's ad-slogan style)
Background and Key Points of This Topic
In August 2014, a major landslide disaster struck Asaminami and Asakita Wards in Hiroshima City, causing catastrophic damage and numerous deaths centered on the Yagi district. It later became widely known that the area’s old place name had been “Yagi Jarakuji Ashidani,” and the narrative spread that people of the past had used the place name to warn of danger. Opinions in the thread were divided on how far old place names can actually be put to use for disaster prevention. Some pointed out that many old names have already been lost to housing development and map renaming, and that terrain itself can change afterward due to things like quarrying — making “today’s hazard maps and topographic maps more practical” — while others held that “place names are still worth heeding as a warning passed down from our ancestors.” Some comments also raised patterns suggesting that certain kanji, such as 梅 (ume), 江 (e), and 橋 (hashi), point to soft ground or flood risk, but readers should keep in mind these are empirical rules of thumb, not academically rigorous confirmation of any individual place name’s origin.
*This article is compiled as an excerpt and summary from the 5channel (Science News+) thread “[Hiroshima] Old Place Name “Yagi Jarakuji Ashidani” Warning Draws Attention as Ancestral Wisdom.”
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