What Is Iwai Falls? A Behind-the-Falls Waterfall in the Forests of Northern Okayama
Iwai Falls (Iwai-daki) is a waterfall about 10 meters high and 6 meters wide, set in the mountains of Kamisaibara, Kagamino Town, Tomata District, Okayama Prefecture.
It lies in the forests of the Chugoku Mountains near the border with Tottori Prefecture, and is introduced as a waterfall close to the northernmost point of Kagamino Town.
Its greatest feature is the large rock slab that juts out above the falls, creating a cave-like space beneath it.
Because you can walk around to the back of the falls and view the cascading water from the inside, it is known as an "urami-no-taki" (a behind-the-falls waterfall).
The cave is said to have a history of being revered as an object of faith.
While most waterfalls are viewed from the front, at Iwai Falls you can encounter a slightly mysterious scene in which the forest seems to show through the other side of the curtain of water.
For international travelers, it is a place where you can feel Japan's mountain nature, water culture, and mountain faith all at once.
However, heavy rain associated with Typhoon No. 7 damaged the walking trail, and further landslides have occurred since, so a notice prohibiting entry has been issued to ensure safety.
The reopening of the trail is expected to be difficult for the time being, so if you are considering a visit, be sure to check the entry status with Kagamino Town or the Okayama Prefecture Tourism Federation.
Top Things to See at Iwai Falls, a Behind-the-Falls Waterfall
The appeal of Iwai Falls is not only the size of the waterfall itself, about 10 meters high.
Its appeal lies in the layered scenery where the massive rock slab, clear water, and deep forest greenery overlap at close range.
Watching the Flow of Water from Behind the Falls
Iwai Falls is known as a rare "urami-no-taki," where you can view the flowing water from behind the falls.
Because you view the falls from beneath the cave-like overhang, it has a depth and power different from viewing a waterfall from the front.
Another distinctive feature is that the sound of the water echoes off the rock slab, and you can feel the falls with your whole body amid the misty spray.
It suits those who want to spend quiet time in nature, and those who want to savor the scenery as an experience rather than just for photos.
The Mountain Atmosphere Surrounded by Forest and the Winter Frozen Falls
Reaching the falls involves walking along high-elevation mountain paths, and from the parking lot you proceed along a roughly 400-meter trail that takes about 10 minutes on foot.
Unlike a tourist spot in town, this is a genuine nature spot to visit while paying attention to your footing and the weather.
When walking, it is reassuring to choose non-slip trekking shoes and clothing that is easy to move in.
In winter (usually from late December to early April), snowfall closes the forest road, and visits are not possible.
It is also famous for the "hyobaku" (frozen falls) in the depths of winter, when the entire waterfall freezes, and once restored, it is a spot where you can enjoy the changing faces of the four seasons.
After rain or in cold seasons, the condition of the path can change easily, so it is important not to push yourself.
The "Iwai" Spring, One of Japan's 100 Best Waters, and the Legend of Fertility Water
About 100 meters before Iwai Falls is a spot where the famous "Iwai" spring water flows.
This spring was selected in 1985 as one of Japan's "100 Best Waters" by the Environment Agency (now the Ministry of the Environment), making it one of Okayama Prefecture's representative famous waters.
A Place to Experience Japan's Famous Water Culture
The "Iwai" spring water has a temperature of about 10°C and a flow of roughly 170 tons per day, and is known as a mellow soft water.
In Japan, clear water springing from the mountains has long been cherished in connection with daily life and faith.
The water around Iwai Falls is one element through which you can sense this Japanese view of nature.
When international travelers visit, understanding the water not merely as a drink but as something tied to local legends and daily life will deepen your appreciation of the trip.
The "Fertility Water" and the Iwai Falls Festival
The "Iwai" spring water is also called the "fertility water" (kodakara-no-mizu).
It derives from a legend that a person who drank this water for 21 days was finally blessed with a long-awaited child, and many people visit to pray for fertility.
Every year on July 10, the "Iwai Falls Festival" is held, gathering local residents and worshippers, where prayers for safe childbirth and fertility have long been offered.
Enjoy the Legends with Respect
The name "fertility water" has a background that has been passed down in the region for a long time.
Even when visiting as a tourist, an attitude of quiet observation, with a sense close to handling something sacred, is appropriate.
By the water, do not raise your voice, and do not forget consideration for the surrounding nature and other visitors.
Check the Entry Restriction Status Before Going to Iwai Falls
Iwai Falls is a spot where checking the entry status before your visit is especially important.
Heavy rain associated with Typhoon No. 7 caused landslides in multiple places along the walking trail and forest road, and further landslides have occurred since, so a notice prohibiting entry has been issued to ensure safety.
Check Official Information Before Heading to the Site
Nature spots can change greatly due to weather, disasters, or restoration work.
In the case of Iwai Falls, too, the safety status of the forest road and walking trail directly determines whether you can visit.
Since reopening is expected to be difficult for the time being, if you plan to include it in your trip, check the entry status on the official Kagamino Town website, "Kagamino Tabi to Kurashi," and Okayama Kanko WEB.
It is important not to base your decision on old visit reports from social media or personal blogs alone.
Do Not Approach While Entry Is Prohibited
Entering an off-limits area is not only dangerous in terms of accidents but also affects restoration work and local management.
Even if your reason is wanting to take a photo or just take a quick look, never enter a restricted area.
In nature tourism in Japan, following signs, ropes, and road-closure notices is basic etiquette.
Waiting for a time when you can enjoy it safely is also a sign of respect for the place you visit.
How to Get to Iwai Falls and Parking Information
Because Iwai Falls is in the mountains of northern Okayama Prefecture, it is a difficult spot to reach by public transport alone.
For future planning after the trail reopens, here is how to get there.
Access by Car
As a guideline, it is about 60 minutes by car from the Innosho Interchange on the Chugoku Expressway, via National Route 179 and other roads.
There is a free parking lot just before the falls, with space for 22 standard cars and 3 large vehicles.
From the parking lot to the falls is about a 10-minute walk along a roughly 400-meter trail.
Access by Public Transport
The nearest station is Innosho Station on the JR Kishin Line, and it is about 60 minutes by car from the station.
Bus services are limited, so using a rental car is the realistic option.
Since gas stations and convenience stores are scarce in the mountains, it is reassuring to fill up on fuel and stock up on food in central Tsuyama City or central Kagamino Town at the foot of the mountains.
Nature Spot Etiquette That International Travelers Should Know
At mountain nature spots like Iwai Falls, you need different preparation and etiquette than for urban sightseeing.
Dress and Pack for Mountain Trails
Even when it becomes possible to visit, the footing is a mountain trail, different from paved city walking.
Choose comfortable sneakers or trekking shoes, and a bag such as a backpack that keeps both hands free will make it easier to move.
Some spots by the water can be slippery, so avoid sandals and shoes with heels, and do not push yourself on days with bad weather.
Because it is high in the mountains, we recommend bringing a long-sleeved layer, insect repellent, and drinks even in summer.
Do Not Take Nature Home
Avoid taking stones, plants, or branches home as souvenirs.
Natural scenery is preserved in the state in which it exists in that place.
Always take your garbage home, and if you eat or drink, do not litter the surroundings.
In the quiet mountain environment, consideration such as not playing music or talking loudly is also necessary.
Put Safety First When Taking Photos
At waterfalls and waterside areas, getting absorbed in taking photos can make you less attentive to your footing.
Do not approach off-limits areas or dangerous rocky places, and take photos in spots that do not block the path.
If you are considering drone or commercial photography, be sure to check the rules of the manager or local government in advance.
If you cannot confirm them officially, it is safer to decide not to do it.
Summary: Iwai Falls Is an Okayama Famous-Water Spot to Enjoy After Checking the Entry Status
Iwai Falls is an "urami-no-taki" (behind-the-falls waterfall), about 10 meters high and 6 meters wide, in the forests of Kamisaibara, Kagamino Town, Tomata District, Okayama Prefecture.
It has plenty to see, including the cave scenery where you can view the flow of water from behind the falls, the "Iwai" spring water selected in 1985 as one of Japan's 100 Best Waters, the legend surrounding the fertility water, and the Iwai Falls Festival held every year on July 10.
On the other hand, due to damage from Typhoon No. 7 and the subsequent landslides, a notice prohibiting entry has been issued to ensure safety, and reopening is expected to be difficult for the time being.
Before your visit, be sure to check the entry status through official information from Kagamino Town or Okayama Kanko WEB.
Even after entry reopens, choose clothing suited to mountain trails, follow the signs, and take care not to damage nature.
Iwai Falls is a place to slowly savor the quiet forest, the sound of water, and the stories handed down in the region.
While valuing safety and etiquette, plan it as a destination for experiencing the famous water and nature of northern Okayama Prefecture.
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