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  1. Home
  2. Places
  3. Saitama
  4. Nagatoro Valley (Iwadatami)
A clear river flows between rocky cliffs and lush green trees under a bright blue sky. Small groups of people stand on the rocks and swim in the water, surrounded by natural scenery.
A clear river flows between rocky cliffs and lush green trees under a bright blue sky. Small groups of people stand on the rocks and swim in the water, surrounded by natural scenery.
A clear river flows between rocky cliffs covered with green trees and plants, under a bright blue sky with a few clouds. Sunlight highlights the greenery and rocks along the water’s edge.
A scenic river flows beside rocky cliffs and trees with autumn foliage, with small boats floating on the water under a clear blue sky and distant forested hills.
A small wooden boat with several people is rowed by a guide along a green river bordered by steep, rocky cliffs and lush, leafy trees on a sunny day.
A calm river reflects a forested hillside with autumn foliage under a blue sky with scattered clouds. Rocky banks line the water, and the sunlight highlights the vibrant colors of the trees.
Saitama

Nagatoro Valley (Iwadatami)

4.2 (5308)Scenic SpotTourist AttractionPoint Of InterestEstablishment

Nagatoro Valley's Iwadatami, located in Saitama, is a hidden gem offering a stunning display of nature's artistry. The name "Iwadatami" comes from the rock formations that resemble layered tatami mats, creating a unique and beautiful landscape along the Arakawa River.

This area is designated as a Natural Park and offers a serene environment just minutes from Nagatoro Station. Visitors can stroll along the natural rock paths and steps, enjoying the picturesque scenery and the gentle sound of the river.

For those seeking more adventure, traditional wooden boat rides navigate the river's rapids, providing excitement and breathtaking views of the valley. The skillful boatmen enhance the experience with their expertise and engaging storytelling​​.

Nagatoro Valley is also a haven for nature enthusiasts and geology buffs, as it is recognized as the "Birthplace of Japanese Geology." The surrounding area features well-maintained promenades, making it easy to explore and appreciate the geological wonders and seasonal beauty, mainly the vibrant autumn foliage​​.

Plan your visit to Nagatoro Valley for a blend of tranquility and adventure. Enjoy the captivating rock formations, exciting river cruises, and the natural splendor that makes this destination truly special.

Hours

Open 24 hours

Closed

No closed days

Available

All year

Minimum Age

All ages are welcome.

Admission Fee

Free

Website
www.nagatoro.gr.jp

The area

Address
Nagatoro, Chichibu District, Saitama 369-1300, Japan

Website

www.nagatoro.gr.jp

What other travelers are saying about Nagatoro Valley (Iwadatami)

When you walk far away enough from the area everyone is in, it is a nice place to relax and watch some frogs. If you move the frogs will bury themselves underground, but if you stay very still, they'll emerge, and they are very cute. It seems you can ride boats here too, but it's just a nice place to walk along the river really.
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Artistic Omens
Nov 5, 2025
Stunning during autumn. A nice, relaxing scenic walk in the cool breeze. You should definitely visit here if you’re in Tokyo or the nearby area in autumn.
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Khanh Linh Nguyen
Nov 29, 2025
It was worth it , must visit this place for peace of mind and to enjoy the beauty of nature .
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Ashim Bhattarai
Dec 30, 2025
It is an unusual terrain with a series of huge rock formations. There are many people near the boat pier, but as you move away from that area, the number of people decreases. It is a very relaxing place rich in nature. The kids enjoyed their rocky adventure. We can find many tadpoles and frogs here. The view of the boats on the river is also beautiful. The boats are very popular and you may have to wait in line for quite a while to get tickets.
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Rintaro
May 4, 2022
Scenic spot with rock formations and a cool river. You can buy tickets for rafting and riding a boat but the lines are long.
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レハ
Jul 20, 2025

Nearby attractions to see

A traditional Japanese Shinto shrine stands surrounded by trees. The ornate building features intricate wooden carvings, a curved roof, and stone lanterns, with a red umbrella and offerings visible to the right.

Hodosan Shrine

A modern shopping mall with a large arched glass entrance and a curved white facade labeled "Cocoon 2," under a clear blue sky, with trees and plants near the front.

Cocoon City

Two people in traditional clothing adjust rows of illuminated red paper lanterns with bold black kanji characters, creating a vibrant display at a festival or cultural event.

Kuki Lantern Festival (Tennousama)

A vibrant red and gold Japanese temple gate stands among tall green trees, flanked by two fox statues on stone pedestals, with intricate carvings and Japanese characters above the entrance.

Mitsumine Shrine

Nearby attractions to see

A traditional Japanese Shinto shrine stands surrounded by trees. The ornate building features intricate wooden carvings, a curved roof, and stone lanterns, with a red umbrella and offerings visible to the right.

Hodosan Shrine

A modern shopping mall with a large arched glass entrance and a curved white facade labeled "Cocoon 2," under a clear blue sky, with trees and plants near the front.

Cocoon City

Two people in traditional clothing adjust rows of illuminated red paper lanterns with bold black kanji characters, creating a vibrant display at a festival or cultural event.

Kuki Lantern Festival (Tennousama)

A vibrant red and gold Japanese temple gate stands among tall green trees, flanked by two fox statues on stone pedestals, with intricate carvings and Japanese characters above the entrance.

Mitsumine Shrine

More about Nagatoro Valley (Iwadatami) from our blog

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March 5, 2026
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Frequently Asked Questions

Yes, Nagatoro Station is only a few minutes from the entrance to Iwadatami.

Yes, there are restrooms and picnic areas for visitors to use.

Yes, you can bring your food and drinks. However, please dispose of trash properly and leave no trace behind.

Yes, leashed pets are allowed in the valley.

Every season offers a unique and beautiful experience, but autumn is especially popular for its vibrant foliage. However, it can also get crowded, so consider visiting during weekdays or early mornings for a more peaceful experience. So, plan your visit based on what you want to see and do!