[Heaven or Hell] Numajiri Motoyu, Numajiri Onsen

Do you know a hot spring river of milky-white water?

The impressive spot must be one of the best hot springs with an exclusion of the fact:

You will have the brush with death from toxic gas.

At this secluded spring, four people were died in 1997 due to the poisoning of volcanic gas.

Today here remains dangerous depending on the weather and ground form.
Please do not approach here if it is not windy.

Even in a windy day, please avoid depression where the gas may be accumulated.

Steep Route of the Climb

You will pass some Ryokans and a ski site, so that you will get to a parking lot.

Thirty minutes’ trail is necessary from the parking.

Even though it is only thirty minutes, the route condition is extremely bad.

Shiraito No Taki

You will see the big waterfall along the way.

This waterfall is located down the stream of the river the water is clouded with the constituents.

The largest amount of discharge in Japan for one spring

You will find an extraordinary spectacle with volcanic smokes.

The smell of volcanic gas (sulfur dioxide and hydrogen sulfide)  is so strong that you will detect no smell in a minute or less.

The acid hot water upwelling from an old mine is famous for the largest amount of discharge (four thousand gallons per minute) in Japan for one spring.

Hot Springs River

A small part of the water is piped to inns at the foot of the mountain; and the most part is unused and overflowed into the milky-white river.

Searching for moderate temperature

The water temperature is extremely hot (160 degrees) and be careful for burn injuries.

I searched for points of moderate temperature, being mixed with river water.


Weather in mountains is changeable in a short time.

It was in October and started to blow strongly, although it can be said safer in terms of the poisoning.

In a frigid climate, I jumped into the river with nothing on.


Is this heaven, or hell?

I felt as if I were at one with great nature, being washed out by overwhelming amount of hot water.


😆 Pros

Unbelievable amount of hot water in an impressive scenery

😥 Cons

Possibility of death from toxic gas

Numajiri Motoyu, Numajiri Onsen, Fukushima, Japan
Walk-in YES
Lodging NO
Official Website NO

Related hot spring

There is a proverb, “a wise man keeps away from danger.”

Sennin Buro

Sennin Buro, Kawayu, Onsen, Wakayama, Japan

Here is another hot spring river, available only in winter.

Hot water upwelling from bottom of the river is mixed with the river water and it enables us comfortable soaking.

It can be said a spot for “a wise man,” because it is much safer and complimentary.

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