Kakita River: A Crystalline Spring-Fed River Born from Mount Fuji
In the small town of Shimizu in Shizuoka Prefecture, an extraordinary natural phenomenon unfolds quietly along the side of National Route 1. The Kakita River (柿田川), Japan's shortest first-class river at just 1.2 kilometers in length, emerges fully formed from the ground itself. There is no trickle from a mountain headwater here—the entire river is born from countless springs welling up through ancient lava beds, fed by snowmelt and rainfall that landed on Mount Fuji nearly three decades ago. Designated a National Natural Monument in 2011, the Kakita River is regarded as one of the Three Great Clear Streams of Japan and offers visitors a rare encounter with water in its purest, most pristine state.
The Story of the River
The Kakita River is unlike any other waterway in Japan. While most rivers gather strength gradually from mountain runoff and tributaries, the Kakita is what hydrologists call a "spring-fed river"—a river born almost entirely from groundwater rising to the surface. Approximately one million cubic meters of water surge up each day from dozens of distinct spring openings, known locally as wakima (湧き間), creating a fully formed river within meters of its source.
A Gift from Mount Fuji
Roughly 10,000 years ago, an eruption of Mount Fuji sent a vast lava flow—now called the Mishima Lava Flow—rushing southward through the valley between Mount Ashitaka and the Hakone mountains. The lava came to rest in the area surrounding present-day Shimizu Town, cooling into a porous, fissured rock formation riddled with cracks and cavities. Over the millennia, rain and snow falling on Mount Fuji's flanks soaked deep underground, traveling slowly through this lava bedrock before finally welling up at the lava flow's terminus. According to studies of tritium concentrations conducted by the Ministry of Land, Infrastructure, Transport and Tourism, the water emerging today fell as precipitation roughly 26 to 28 years ago—a quietly remarkable testament to the long, hidden journey of every drop.
Dancing White Stones
If you peer carefully into the deepest spring openings, you will notice small white stones rising and falling, as though dancing on invisible currents. These are not ordinary pebbles. They are fragments of pumice ejected by the Kawagodaira eruption on the Izu Peninsula approximately 3,200 years ago. Buried for millennia, the lightweight pumice is now being lifted gently to the surface by the upward force of the springs—a slow-motion choreography between geological deep time and the living river.
Why It Was Designated a Natural Monument
On September 21, 2011, the Kakita River was designated a National Natural Monument under the "Geology and Minerals" category. It is only the second river in Japan to receive natural monument status in its entirety, the first being the Shio River in Motobu, Okinawa. The designation recognizes a constellation of qualities found together nowhere else in the country: the immense and remarkably stable volume of spring water issuing from the Mishima Lava Flow; water of such exceptional purity that it can be safely consumed directly from the source; and the visible geological record—those drifting pumice stones—of two distinct volcanic events whose legacies still shape the river today.
The path to designation was not without struggle. During the rapid industrial expansion of the postwar decades, factories were drawn to the area precisely because of the abundant clean water, and effluent discharge eventually degraded the river's water quality to the point where fish could no longer survive. Beginning in the mid-1970s, local residents launched grassroots conservation efforts that grew into a national trust movement, purchasing land along the riverbanks, encouraging the relocation of polluting facilities, and steadily restoring the ecosystem. The 2011 designation crowned decades of patient citizen-led recovery, and conservation work continues to this day.
What to See and Experience
The Two Observation Decks
Within Kakitagawa Park, two viewing platforms allow visitors to look down into the heart of the spring system. The First Observation Deck overlooks the uppermost reach of the river, where dozens of wakima can be seen bubbling continuously from the gravel bed. The Second Observation Deck offers a more dramatic view: a deep, cobalt-blue circular pool that was originally carved out as a water intake by a former textile factory. Today this disused well, more than five meters deep, has become an unexpectedly beautiful artifact—an ethereal blue eye looking up from the river floor.
The Spring Plaza and Yatsuhashi Bridge
At the Spring Plaza (湧水広場), visitors can dip their hands or feet directly into the spring water, which maintains a temperature close to 15°C year-round—refreshingly cool in summer and surprisingly mild in winter. Many visitors miss the wooden zigzag bridge known as the Yatsuhashi (八つ橋), tucked along the lower part of the park. This is a quiet mistake to avoid: the Yatsuhashi crosses the middle reach of the river and offers some of the most graceful views of the clear flowing water, framed by overhanging greenery.
Wildlife and Plants
The constant year-round water temperature creates a stable environment that supports rare and protected species. Visitors may spot the Mishima baikamo, a delicate aquatic buttercup that sways gently in the current, as well as the Genji firefly during early summer evenings. The river is also home to ayu (sweetfish), amago, kingfishers (kawasemi), and many other species. In winter, the warmer water allows ayu—usually a one-year fish elsewhere—to occasionally overwinter here.
Drinking the Water
Within the park grounds, a free water-collection point allows visitors to sample and bottle the spring water themselves. Local residents regularly arrive with large containers to take home a supply, and visitors are welcome to bring an empty bottle or purchase one nearby. The water is clean enough to drink directly without treatment.
Surrounding Attractions
The Kakita River sits at a highly convenient point between the cities of Mishima and Numazu, making it easy to combine with other regional highlights. Mount Fuji itself dominates the northern horizon on clear days, while the hot spring resorts of Hakone and the volcanic landscapes of the Izu Peninsula are within easy reach.
- Mishima Taisha Shrine — one of the most venerable shrines on the Izu Peninsula, about 10 minutes by car
- Rakujuen Park — a Meiji-era garden in Mishima fed by its own springs
- Kifune Shrine within Kakitagawa Park — a branch of Kyoto's Kibune Shrine, dedicated to water and matchmaking
- Numazu Port — famous for fresh seafood, about 15 minutes by car
- The site of Izumigashira Castle, a former Hojo clan stronghold, lies within the park grounds
- Tofu and yuba restaurants near the park serving dishes prepared with the spring water
- 📍 Plan Your Visit to Shizuoka
- Find tours, activities & transport passes near Kakida River
- [ Mt. Fuji Views & Atami Hot Spring Resorts ]
Q&A
- Is the spring water really safe to drink directly?
- Yes. The water is filtered naturally over decades through volcanic rock and is recognized for its exceptional purity. The site is selected as one of Japan's 100 Famous Waters, and many local residents collect it for daily use. A free water-collection point is provided within the park.
- When is the best time of year to visit?
- The river is beautiful in every season. Spring brings fresh greenery, early summer offers Genji fireflies in the evenings, autumn provides crisp air with vivid foliage, and winter reveals the deep blue of the springs against bare branches. Because the water temperature is stable year-round, the river never freezes and rarely changes character.
- How long should I plan to spend here?
- A relaxed visit typically takes about 60 to 90 minutes, allowing time to walk between the two observation decks, the Spring Plaza, and the Yatsuhashi Bridge. Visitors who wish to enjoy a meal at one of the nearby tofu or noodle restaurants should plan for two hours or more.
- Is the park accessible for visitors with limited mobility?
- Most of the main pathways are well-maintained and walkable, but reaching the observation decks involves several flights of stairs that may be challenging for some visitors. The riverside walking paths and the area around the Spring Plaza are gentler in terrain.
- Why is this called the shortest first-class river in Japan?
- "First-class river" is a designation given by the Japanese government to important river systems. Although the Kakita River is only 1.2 kilometers long, it carries an enormous, stable volume of pure water and is considered an essential part of the larger Kano River system, which leads to its first-class status despite its short length.
Basic Information
| Name | Kakita River (柿田川) |
|---|---|
| Designation | National Natural Monument (Geology and Minerals) |
| Date of Designation | September 21, 2011 (additional area added in 2014) |
| Location | 71-7 Fushimi, Shimizu-cho, Sunto-gun, Shizuoka Prefecture 411-0907 |
| Length | Approximately 1.2 km (the shortest first-class river in Japan) |
| Daily Spring Volume | Approximately 1,000,000 cubic meters per day |
| Water Temperature | Approximately 15°C year-round |
| Park Hours | Open at all times (no closing hours) |
| Admission | Free |
| Parking | Cars: ¥200 per visit / Buses: ¥1,000 per visit |
| Access | About 1 minute on foot from "Kakitagawa Yusui Koen-mae" bus stop, reachable by Tokai Bus from JR Mishima Station (south exit) or JR Numazu Station; approximately 15 minutes by car from Numazu IC on the Tomei Expressway |
| Managing Organization | Shimizu Town, Shizuoka Prefecture |
| Other Recognitions | Japan's 100 Famous Waters (1985); One of the Three Great Clear Streams of Japan; Izu Peninsula UNESCO Global Geopark site (2018) |
References
- 柿田川 - 文化遺産オンライン (Cultural Heritage Online — Bunka Iyo Online)
- https://bunka.nii.ac.jp/heritages/detail/240403
- 柿田川公園 - 静岡県清水町 (Kakitagawa Park — Shimizu Town Official Website)
- https://www.town.shimizu.shizuoka.jp/toshi/toshi00054.html
- 柿田川 | 南から来た火山の贈りもの - 伊豆半島ジオパーク公式サイト (Izu Peninsula Geopark Official Site)
- https://izugeopark.org/geosites/kakitagawa/
- 柿田川公園 - 清水町観光案内所「わくら柿田川」 (Shimizu Town Tourism Information)
- http://www.kakitagawa-kanko.jp/sightseeing/kakitagawa/
- 柿田川へのアクセス - 清水町商工会 (Shimizu Town Chamber of Commerce — Access Information)
- https://www.kakitagawa.or.jp/blank-6
- 柿田川 - Wikipedia
- https://ja.wikipedia.org/wiki/柿田川
Last verified: 2026.04.27