The Niyodo River: A Guide to “Niyodo Blue” and Beyond

What is the Niyodo River?

Flowing across Ehime and Kochi Prefectures, the Niyodo River stretches for 124 kilometers with a basin of 1,560 square kilometers. On the Ehime side it is called the Omogo River, but once it reaches Kochi, it becomes the Niyodo—the name that travelers remember.

The river has been designated a Class A River by Japan’s Ministry of Land, Infrastructure, Transport and Tourism, marking it as especially important for both national land conservation and the economy.

It is also home to several dams, such as the impressive Odo Dam (the second largest in Shikoku), along with the Kae Dam and Ikadazu Dam, built for flood control and hydroelectric power generation. These facilities make the Niyodo one of the most utilized rivers in the region.

Here are three key features that make the Niyodo River stand out.

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

The Cleanest Water in Japan

In 2019, after a survey of 162 Class A rivers nationwide, the Niyodo River was awarded No.1 in water quality for the second consecutive year.

It was also recognized as one of Japan’s 16 rivers with the very best water quality that year—the only one in all of Shikoku to receive this distinction.

A Paradise for Outdoor Leisure

The river’s middle to lower reaches are abundant in water, creating an ideal setting for outdoor fun. Visitors can enjoy camping, fishing, canoeing, and more.

In recent years, adventurous activities like rafting, stand-up paddleboarding (SUP), and shower climbing have also become popular, drawing nature lovers and thrill-seekers alike.

The Magical “Glowing Forest”

In the midstream area rises Mt. Yokokura, known as the “Glowing Forest.”

The forest owes its name to luminous mushrooms (Shiinotomoshitake) and the countless fireflies that inhabit the area. Depending on the season and time, you can witness a breathtaking collaboration between crystal-clear waters and flickering natural lights.

The Famous “Niyodo Blue”

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

Above all, the Niyodo River is celebrated for its extraordinary color: a mystical, pure shade of blue known as “Niyodo Blue.”

The name was coined by nature photographer Nobuyuki Takahashi, who was captivated by its clarity and brilliance. Since then, travelers from all over the world have come seeking this remarkable sight.

The reason behind the vivid blue is not completely proven, but leading theories include:

・The water temperature is low, making it difficult for algae to grow.
・The hard surrounding rock produces little mud or sediment.
・The current is swift, preventing impurities from building up.
・Clearer water reflects more blue wavelengths of sunlight, making it appear more vivid.

While the “Niyodo Blue” can be seen along most of the river, certain locations are especially famous for it:

・Niko Falls (Niko-buchi)
・Nakatsu Gorge
・Yasui Gorge (particularly Suisho-buchi and the Sabō Dam)

Because the color shifts depending on season, weather, and sunlight, no two visits are exactly the same—an invitation to return again and again.

Must-See Spots Along the Niyodo River

Here are seven destinations you won’t want to miss.

Nagoya Chinka Bridge(submersible bridges)

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

The longest of the six chinka bridges (submersible bridges) along the Niyodo, stretching 196 meters.

When the water is shallow, you can see fish swimming beneath in the shimmering blue—an image that has made the bridge especially popular on Instagram.

It is also the closest submersible bridge to Kochi City and is still used as a daily crossing by local residents.

(Chinka bridges are designed without railings; they function as regular bridges during low water but submerge beneath the surface when the river floods.)

Niko Falls (Niko-buchi)

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

This waterfall basin in the upper reaches of the river is perhaps the most iconic view of Niyodo Blue.

Once considered sacred—the locals believed a great serpent god lived here—it was avoided for generations. That changed after photographer Nobuyuki Takahashi captured its beauty, spreading its fame across social media.

The most magical time to visit is around midday on a clear day, when sunlight pours directly into the basin, creating an otherworldly glow.

Suisho-buchi (Crystal Basin)

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

One of the most celebrated spots for seeing Niyodo Blue. Depending on light and time of day, the water here shifts between deep green and dazzling blue.

Parking is limited nearby, so the recommended approach is to park at Horaiso Inn and walk.

Sabō Dam

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

Located near Suisho-buchi, this dam forms a pool of striking blue water that never fails to impress visitors.

Hiryū Falls (“Flying Dragon Falls”)

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

A two-tiered waterfall with a 30-meter drop. Its twisting form resembles a dragon about to take flight, inspiring its name.

During heavy rains, its power is overwhelming, and the basin shines with dramatic Niyodo Blue. It is one of the highlights of Yasui Gorge.

Mikaeri Falls (“Looking Back Falls”)

The first waterfall you’ll encounter when entering Yasui Gorge. Its name comes from the irresistible urge to look back one more time before leaving.

The water cascades down in multiple small tiers, its abundant flow a testament to the power of the Niyodo.

Seryū Falls (“Back Dragon Falls”)

Discovered in 2001 after surrounding trees were cleared, this waterfall plunges 60 meters in a single drop.

After heavy rain, its flow intensifies and sometimes creates a second waterfall right beside it—a rare spectacle.

Food Around the Niyodo River

Exploring the river can work up an appetite. Here are some recommended spots nearby.

Hatayama Garden

A restaurant specializing in pizzas topped with fresh, seasonal vegetables chosen by a certified vegetable sommelier.

Image courtesy of Hatayama Garden

・Fruit Tomato Pizza (for 2–3 people, ¥1,750)
・Stir-Fried Veggie Pizza (single, ¥930)
・Fresh Tomato & Tuna Mayo Pizza (single, ¥980)

They also serve over ten kinds of fresh juices, making it a great choice for families.

Ikegawa Tea Garden Café

Founded by female tea farmers in Niyodogawa Town, this café specializes in handmade sweets infused with their own carefully grown tea leaves.

・Tea Flavored Tiramisu

・Tea flavored Roll Cake

・Tea Flavored Pudding

They also serve high-quality teas such as hōjicha and kabusecha. Products can be ordered online, so you can bring the taste of Niyodo to your home.

All photos courtesy of the official website of Ikegawa Tea Garden Café (https://www.ikegawachaen.jp/)

Asunaro (Tea Farmer’s Restaurant)

A café-restaurant run by tea farmers, offering dishes made with local specialties such as Sawadachi tea.

Highlights include:

・Asunaro Set Meal (¥1,580)
・Sawadachi Tea Udon Set (¥1,180)
・Hand-baked Sawadachi Tea Waffle (¥1,080)

You can even brew your own tea with a traditional kyūsu teapot, making this a particularly authentic experience.

Relaxation Spot

Yunomori

After exploring, unwind at Yunomori, a traditional inn offering lodging, hot springs, and meals.

Rooms: Japanese-style rooms and private cottages with views of the Nakatsu River.
Hot Springs: Alkaline mineral waters believed to help with muscle pain, joint stiffness, and fatigue.

Meals: Seasonal dishes using local vegetables, along with Kochi specialties such as bonito tataki.

Recommended Camping: Snow Peak Ochi Niyodo River Camp Field

One of the most popular campgrounds in the area, located right on the riverbank. It offers 30 campsites, suitable for everyone from beginners to seasoned campers.

You can even stay in wooden mobile cabins called “Jyubako.” Canoeing, rafting, and other river activities are also available, making it perfect for summer trips.

Access to Niyodo River

The easiest way to reach Yasui Gorge is by car. Rental cars are available at both Kochi Airport and JR Kochi Station. Enter “Horaiso Inn” in your GPS—it’s the only inn in the gorge and has a large parking lot.

If you’re not confident driving narrow roads, taxis are recommended. Private-hire taxis are available from:

・Kochi Ryoma Airport
・JR Kochi Station
・Hotels in Kochi City
・JR Ino Station
・JR Sakawa or JR Nishi-Sakawa Stations

Rates: 4 hours for ¥25,200 (1–4 people).

Conclusion

Image courtesy of the Niyodo Blue Tourism Association(画像提供：一般社団法人仁淀ブルー観光協議会)

From its legendary “Niyodo Blue” waters to its waterfalls, outdoor activities, local cuisine, and soothing hot springs, the Niyodo River offers an experience that is both dynamic and deeply restorative.

Let this guide inspire your journey, and discover one of Kochi Prefecture’s most unforgettable natural treasures.