Shiretoko's Hidden Gem: Climbing a Miraculous Waterfall Where Hot Springs Flow! A Wild and Moving Experience at Kamuiwakka Hot Falls

Shiretoko, a UNESCO World Natural Heritage site. Its magnificent nature overwhelms visitors, and its untouched primeval forests and rugged coastlines allow one to feel the very breath of the Earth. But did you know that deep within Shiretoko lies a rare and little-known place?

It is the Kamuiwakka Hot Falls, a truly "miraculous waterfall" where the river itself becomes a hot spring, and its warm waters cascade down as a waterfall.Originating from Mount Iwo, an active volcano located almost in the center of the Shiretoko Peninsula, the Kamuiwakka River features a series of waterfalls where each basin acts like a natural open-air bath, earning it the nickname "noyu" (wild hot spring).The name "Kamuiwakka" is said to mean "water of the gods" or "water of the demons" in Ainu, due to its strong acidity.This place offers a special kind of profound emotion that, once experienced, is unforgettable. I myself have visited this hidden gem twice, and each time I was deeply moved, making it one of my favorite spots in Shiretoko.

In this article, I will provide a comprehensive guide to Kamuiwakka Hot Falls, its unique charm, and how to safely and fully enjoy this extraordinary experience.

The Charm of Kamuiwakka Hot Falls: A Wild Experience Stimulating All Five Senses

The experience at Kamuiwakka Hot Falls is truly a "hot spring river climb." A unique adventure awaits you, where you ascend a river flowing with warm hot spring water, much like river trekking, a rare experience in Japan.The distinct scent of sulfur fills the air, warm hot spring water flows beneath your feet, and you are surrounded by untouched primeval forest. This "secret hot spring," with almost no artificial facilities, offers visitors an extraordinary sense of wonder.

Here, you can experience the power of nature with all five senses:

• Smell: The distinct scent of sulfur emanates from the hot spring water, which originates from Mount Iwo , allowing you to truly feel the breath of the earth.

• Touch: The warm hot spring water, around 30°C , flowing beneath your feet feels like a comfortable warm pool.Although the strong acidity prevents moss from growing , the wet stones at the water's edge can be slippery , so you'll need to carefully feel your way with each step.

• Hearing: The roar of the waterfall contrasts with the silence of the surrounding forest, telling a story of Shiretoko's profound depth.

• Sight: The untouched nature surrounded by primeval forest is truly breathtaking.The beauty of the clear water flowing into the waterfall basins is enough to make you gasp.

The scenery that unfolds after climbing the waterfall and the blissful moment of immersing yourself in the natural hot spring will surely be an unforgettable experience.The sense of accomplishment from overcoming challenges and the deep refreshment gained in the heart of nature will make you forget the hustle and bustle of everyday life.

Why a "Hidden" Gem? The Special Nature of Kamuiwakka

There are several reasons why Kamuiwakka Hot Falls is called a "hidden gem."

Access Restrictions and Seasonality

First, access to this waterfall is strictly limited. The road leading to Kamuiwakka Hot Falls is typically open only from early June to late October, excluding large vehicles, making the accessible period very short. During this period, especially in August and September when crowds are expected, a private vehicle restriction period is enforced. During this time, private cars are prohibited from entering the section from Shiretoko Goko (Five Lakes) to Kamuiwakka (approximately 12 km), and the use of a dedicated shuttle bus is mandatory. Furthermore, this location is not extensively detailed on Google Maps, which further enhances its "hidden gem" status.

The free parking lot directly in front of Kamuiwakka Hot Falls has space for about 20 cars.However, the approximately 20 km (40 minutes one way) from Shiretoko Nature Center to Kamuiwakka Hot Falls, especially the 11 km beyond Shiretoko Goko, is an unpaved gravel road. Some sections of this road are narrow, requiring caution when passing oncoming vehicles. Also, gravel can be kicked up and dust can be severe, so drivers unfamiliar with such roads should be particularly careful. For public transport access, take the Shari Bus bound for Shiretoko Utoro Onsen from JR Shiretoko-Shari Station (approx. 55 minutes) and alight at Utoro Onsen Bus Terminal. Then, transfer to the Shari Bus bound for Shiretoko Goko (approx. 10 minutes) and alight at the "Shiretoko Nature Center Mae" bus stop. From there, take a dedicated shuttle bus (approx. 50 minutes) to the "Kamuiwakka Hot Falls" bus stop, followed by a 10-minute walk. Shuttle bus fares are 1,980 yen round trip from Utoro Onsen Bus Terminal and 1,300 yen round trip from Shiretoko Nature Center. Since 2023, advance reservations and a fee are required to use Kamuiwakka Hot Falls. Reservations for 2025 are scheduled to begin at 13:00 on April 18 (Friday). Fees vary by period: during the Kamuiwakka private car period (July 1 to August 7, and August 18 to September 30, 2025), it's 2,200 yen for adults and 550 yen for elementary/junior high school students. During the private car restriction period (August 8 to August 17, 2025), it's 3,000 yen for adults (including bus fare) and 750 yen for elementary/junior high school students (including bus fare).Separate fees apply for those accessing on foot or by bicycle without using the bus.

Need for Special Preparation and Knowledge

Kamuiwakka Hot Falls is not a typical tourist destination; it's an activity comparable to "river trekking" in difficulty.Therefore, it requires special preparation and knowledge not typically needed for regular sightseeing. Essential items include river trekking shoes or water shoes for safely navigating the slippery river , swimwear or quick-drying clothing suitable for getting completely wet , and a change of clothes and a waterproof bag.Furthermore, Shiretoko is home to brown bears, and the area around Kamuiwakka Hot Falls is frequently visited by them.Therefore, it's crucial to be familiar with bear countermeasures such as ringing a bell, storing food in airtight containers to prevent odors, not littering, and knowing what to do if you encounter a bear.The fact that mobile phone signals are extremely weak in this dead zone further emphasizes the importance of safety management.

Coexistence with Nature Conservation

The pristine nature of Kamuiwakka Hot Falls is closely linked to the strict environmental conservation efforts in Shiretoko, a World Natural Heritage site. The prohibition of entry upstream from "Ichino-taki" (First Waterfall) due to the risk of falling rocks is a measure to balance visitor safety with the preservation of the natural environment. The introduction of an advance reservation system and fees since 2023 also reflects Shiretoko's commitment to sustainable tourism.

The Value of Your Guide

Precisely because it is such a special place, the presence of an experienced guide becomes extremely important. My van life experience and deep knowledge of Shiretoko will facilitate your access to Kamuiwakka Hot Falls and alleviate your concerns regarding bear countermeasures and safety management. Furthermore, by providing in-depth knowledge about Shiretoko's nature and ecosystem, I can lead you to an experience filled with learning and profound emotion, beyond just an activity.

Tips and Precautions for Your Visit

To safely and fully enjoy Kamuiwakka Hot Falls, please refer to the following tips and precautions.

Best Season

Kamuiwakka Hot Falls is typically accessible only from early June to late October.Among these periods, the summer months, when the water temperature is relatively higher, are recommended.Each season offers a different charm: the vibrant new greenery, the refreshing mid-summer heat, and the beautiful autumn foliage.

Essential Gear

Appropriate gear is essential for the river trekking experience at Kamuiwakka Hot Falls.

• Footwear: The most important item is non-slip footwear. River trekking shoes, water shoes, marine shoes, or felt-soled tabi socks are ideal. Avoid walking barefoot and wear socks that can protect your ankles and shins.Water shoes can also be rented at the Shiretoko Nature Center.

• Clothing: Quick-drying synthetic clothing is recommended for both top and bottom.To prepare for falls and abrasions, it's advisable to wear clothing that covers your skin (long sleeves and long pants, or half-pants combined with tights). Some people wear swimwear, assuming they will get completely wet.A full change of clothes is essential after the experience.

• Carried Items:

  • Helmet: Helmets are provided free of charge to all visitors at the entrance and must be worn.

  • Waterproof Bag: Electronic devices such as cameras, smartphones, and car keys should always be placed in a waterproof bag to protect them from strong acidity and water damage.

  • Towel: Essential for drying off after getting wet.

  • Fresh Water: Be sure to bring fresh water (e.g., in a plastic bottle) to rinse off your skin if it becomes itchy due to the strong acidic hot spring water.

  • Drinks: Bring about 500ml of water. It's wise to avoid sweet drinks in bear habitats.

  • Gloves/Work Gloves: Not essential, but useful for protecting your hands and providing grip when climbing rocks.

  • Small Backpack: Keep belongings to a minimum and store them in a small backpack that leaves both hands free.

Safety Precautions

• Slippery Areas: Although the strong acidity prevents moss from growing, wet stones at the water's edge can be slippery.When descending, the trick to avoiding slips is to walk in the water with small steps, keeping your upper body upright.

• Weather Hazards: If the water is cloudy or the river is swollen, it may indicate heavy rain or falling rocks upstream, so absolutely do not enter.

• Restricted Areas: Currently, entry upstream from "Ichino-taki" (First Waterfall) is prohibited due to the high risk of falling rocks.Previously installed ropes and other aids may have corroded due to the strong acidic hot spring water and lost their durability, so it is strongly advised not to rely on or use them.

• Strict Adherence to Nature Reserve Rules: Shiretoko National Park has strict rules, including not straying from paths, not collecting plants or animals, taking all trash with you, not feeding wildlife, not bringing pets, and not eating while walking on trails.Adhere to these rules to minimize your impact on the natural environment.

• Precautions for Strong Acidic Hot Springs: The water quality of Kamuiwakka Hot Falls is highly acidic, with a pH of about 1.6 to 2.Due to its strong stimulating properties, children, the elderly, and those with sensitive skin or mucous membranes may experience skin irritation or a tingling sensation after use.Avoid prolonged bathing and always rinse off with fresh water after use.Metal accessories and electronic devices may corrode or discolor due to the strong acidity, so remove them or take strict waterproofing measures.The river water is not suitable for drinking.

• Brown Bear Countermeasures: Shiretoko is entirely a brown bear habitat.It is essential for a safe experience to be familiar with measures to avoid encountering bears (such as ringing a bell, sealing food, not littering) and actions to take in case of an encounter (such as remaining calm, slowly backing away, carrying bear spray).

• Mobile Phone Signal Status: The Kamuiwakka area is a dead zone with extremely weak mobile phone signals.Considering the possibility of being unable to make contact in an emergency, take thorough precautions, such as moving in groups or considering a guided tour.

• On-site Facilities: There are three temporary toilets and two to four temporary changing rooms on site.There are no vending machines or shops, so you need to prepare drinks and other necessities in advance.

Conclusion

Kamuiwakka Hot Falls in Shiretoko, Hokkaido, is not just a tourist destination. It is a rare experience that stimulates all five senses and allows you to become one with nature, as hot spring water from an active volcano forms a river that you ascend on foot. The unique environment created by the strong acidic water is sometimes harsh, sometimes mystical, telling the profound story of this place with its two faces: "water of the gods" and "water of the demons."

Precisely because it is a "hidden gem" with access restrictions and requiring special preparation, the sense of wonder and accomplishment upon reaching it is all the greater. Within the strict conservation system of a World Natural Heritage site, pristine nature is preserved, offering visitors a truly wild experience.

What kind of profound experience do you wish to have at this "must-visit place of a lifetime"?

Don't you want to experience such a hidden gem in Shiretoko safely and to its fullest? I, Ryoto, will plan and guide your personalized Shiretoko adventure, including Kamuiwakka Hot Falls. Let's explore the true charm of Japan, beyond what guidebooks can offer, together!