Simple Springs (Tanjun Onsen): Gentle Waters for Everyone

Aone Onsen is said to have opened in 1528 and served as the palace bath of the Date clan of the Sendai domain. This 49.8°C blend of six sources flows into the tubs without added water or heating: a clear, light simple spring. With moderate sulfate and bicarbonate, it leaves the skin feeling fresh and light. Gentle and slowly warming, it suits those who wish to sink quietly into historic stone and wooden tubs in the snowy mountains of Zao.

This hot spring embodies the enduring passion of pioneers, delivered from Kuronagi Onsen in the upper reaches of the Kurobe River to Unazuki Onsen, approximately 7km downstream, after arduous wooden pipe laying construction in Taisho 12 (1923). Gushing at an abundant rate of approximately 2,000 liters per minute, its colorless and transparent waters seem to embody the pristine clarity of the gorge itself. With a soft touch that gently envelops the skin, it slowly warms the body to its core. Ideal for those seeking to unwind their mind and body, embraced by nature, at the various inns and public bathhouses throughout the town.

This private spring gushes near Lake Kinrin in Yufuin, one of Japan's premier onsen destinations. The ETAVIA Yufuin Kinrinko Gensen is a simple hot spring, blessed by Mt. Yufu, known for being gentle and non-irritating to the skin. Within the history of Yufuin, long cherished as a health resort, this water has quietly soothed the minds and bodies of its visitors. Surrendering to the bath, you'll feel a smooth, lotion-like texture envelop your skin, allowing you to forget the hustle and bustle of daily life. It is a spring full of gentleness, recommended for those seeking a moment of peace.

Gero Onsen counts among Japan's three famous springs, and legend holds that when its waters once vanished, a white heron alighted on the Masuda riverbank to reveal a new gush sent by the healing Buddha Yakushi. The Gero Onsen Koda pump station source gathers several centrally managed wells and sends them to inns across the Koda district. Its pH 9.4 alkaline water glides softly over the skin and lingers as a light, refreshed feeling afterward, soothing travelers who seek gentle rest.

Okudogo No. 4-1 Gensen is drawn from the gorge upstream along the Ishite River from Dogo's historic spa town. Its lukewarm 38.7°C water is alkaline at pH 9.4 and pairs hydrosulfide ions with radon, an uncommon combination. A faint sulfur scent and slippery feel suit bathers who like long, unhurried soaks to the sound of the stream.

Nestled in a tranquil Yamanashi City village, Shotokuji Onsen is a simple, therapeutic hot spring, cherished by locals for generations. Its highly alkaline waters, boasting a pH of 9.5, offer a thick, serum-like texture. As you slowly immerse yourself in the lukewarm bath, daily stiffness gently melts away, offering deep relaxation and potential pain relief. After your soak, anticipate surprisingly silky skin and a renewed sense of rejuvenation, perfect for those seeking an escape from the hustle to indulge in self-care.

The Poppo-an source is a private wellspring drilled in the tranquil countryside of Yufuin, one of Japan's premier onsen destinations. Located amidst serene landscapes with views of Mt. Yufu, its name is said to derive from the beloved local train that runs nearby. This alkaline simple spring is characterized by its gentle, non-irritating waters that seem to smoothly envelop the skin. After bathing, your skin will feel deeply moisturized, filling both mind and body with profound relaxation.

Gero Onsen counts among Japan's three famous springs, and legend holds that when its waters once vanished, a white heron alighted on the Masuda riverbank to reveal a new gush. The Gero Onsen Soto pump station source draws on several centrally managed wells and sends them on to inns throughout the hot-spring town. Its pH 8.9 alkaline water glides softly over the skin and lingers as a light, refreshed feeling, soothing travelers who stroll the hot-spring town and seek gentle rest.

This is the water of a bathing retreat in a valley near the source of the Yosasa River, at the very end of the Nasu hot spring area. Legend says a great tengu found the springs here around 770, and the site once served as a training ground for mountain ascetics. Ai no Yu is drawn into a Meiji-era bathhouse whose name recalls that it was once the only mixed bath. Rising naturally at 85.3 L/min and brimming over the tub's edge, it suits those who want to lose track of time at a mountain toji retreat.

Shuzenji Onsen traces its origin to the monk Kobo Daishi, said to have struck a rock with his tokko and released hot water. Today the Shuzenji Onsen Mixed Source gathers wells scattered across Shiraida, Koyama and Minamiyama, blending them into one gentle alkaline flow. Its smooth touch lingers on the skin, soothing travelers who steep beside the murmuring Katsura River.

Kumanotearaiyu Gensen takes its name from a legend of a wounded bear, fleeing hunters, that soothed its injuries in these waters, and it is regarded as the birthplace of Nozawa Onsen. Said to have been opened in the Kamakura period, the spring still gushes naturally at 251 liters per minute. Its clear water carries a faint sulfur scent and leaves the skin smooth, with a light, refreshed feeling that lingers after bathing — a fitting soak for travelers tracing the roots of Nozawa's bathing culture.

Murata Onsen is a pumped, drilled source in Kawakami, part of Yufuin, a spa town famed for its abundant springs. It emerges at a hot 63.9°C, and the clear, faintly yellow-brown water carries small dark-brown mineral flakes. Though mild as a simple spring, it is rich in metasilicic acid at 189.0 mg/kg, leaving a soft, clinging feel on the skin—ideal for unhurried soaks in the quiet hills.

Kidachi Onsen Yugashima No. 23 takes its name from a legend that Minamoto no Yoritomo, spotting steam among the rocks while hunting, pried them up with a wooden sword and released the water. Set beside the Kano River in literary Amagi-Yugashima, its calcium and sodium share the cations almost equally while sulfate and bicarbonate balance the anions. Clear, tasteless and odorless, it is a quiet, unassuming water.

This private source gushes forth in Yufuin Onsen, one of Japan's leading hot spring resorts. Nurtured in the tranquil environment of the Yufuin Basin, this source boasts a generous flow. The mildly alkaline water, with a pH of 8.5, is soft to the touch, clear, and gentle, making it appealing to everyone. Containing an exceptionally high 302.0 mg/kg of metasilicic acid, it is expected to leave the skin feeling moist and silky smooth after bathing. It is an ideal spring for those seeking a peaceful bath to release mind and body while feeling the grand nature of Mt. Yufu.

Mimata Onsen is said to have been discovered in 1864, late in the Edo period, along the Mimata River, a tributary of the Gonokawa. Around the Russo-Japanese War it hosted a convalescent home for the Hamada regiment, and it has served as a toji spa for over a century. Today's water flows naturally from a well drilled in 1996, marked by strong alkalinity at pH 9.7 and a slippery feel that wraps the skin.

This Radon-sen No. 1 source plays a key role as one of the "Ginsen" (Silver Springs) that color the history of Arima Onsen, one of Japan's three ancient hot springs. In contrast to the reddish-brown "Kinsen" containing iron, Ginsen is characterized by its clear, smooth feel. The water from this source is said to gently stimulate cells and vitalize the body as it's absorbed through breathing.

This hot spring embodies the enduring passion of pioneers, delivered from Kuronagi Onsen in the upper reaches of the Kurobe River to Unazuki Onsen, approximately 7km downstream, after arduous wooden pipe laying construction in Taisho 12 (1923). Gushing at an abundant rate of approximately 2,000 liters per minute, its colorless and transparent waters seem to embody the pristine clarity of the gorge itself. With a soft touch that gently envelops the skin, it slowly warms the body to its core. Ideal for those seeking to unwind their mind and body, embraced by nature, at the various inns and public bathhouses throughout the town.

The Bato Onsen area of Nakagawa sits among the clear Naka River and the wooded Yamizo hills. Nanpeidai Onsen has been used on its hilltop site since 1973, and in 1987 a 1,030 m well tapped a plentiful new alkaline flow. Its silky pH 9.6 water is known locally as a "beauty bath" and is also used for drinking cures.

Gero Onsen counts among Japan's three famous springs, and legend holds that when its waters once vanished, a white heron alighted on the Masuda riverbank to reveal a new gush. The Gero Onsen Soto pump station source draws on several centrally managed wells and sends them on to inns throughout the hot-spring town. Its pH 8.9 alkaline water glides softly over the skin and lingers as a light, refreshed feeling, soothing travelers who stroll the hot-spring town and seek gentle rest.

Osawa Onsen, a famed hot spring in Iwate reportedly beloved by author Kenji Miyazawa, draws from the "Osawa-no-Yu" source. It boasts a silky, lotion-like texture, a gift of its high alkalinity at pH 9.0. Soaking in this smooth water, like a fine lotion, gently exfoliates the skin, leaving it feeling exceptionally smooth after your bath. It's a gentle, healing spring that soothes both mind and body, perfect for those seeking a peaceful escape to unwind and care for themselves.

Asama Onsen is an ancient spa long loved as the back parlor of Matsumoto's castle town, said to be the "Tsukama no Yu" mentioned in the Nihon Shoki or a spring found by the Inukai clan in the Heian era. In the Edo period the Matsumoto domain kept a lord's bathhouse here, and samurai bathed in separate pools by rank. The No. 2 Source is the main spring supplying the town's inns, pumped up at around 49°C. Its alkaline water, carrying sodium, calcium and sulfate, suits travelers who want a quiet, warming soak steeped in castle-town history.

Bessho Onsen No.4 Source is one of the springs of Bessho Onsen, a 1,400-year-old spa some link to the "Nanakuri no yu" praised in The Pillow Book, and it is said to feed the drinking fountain at Kitamuki Kannon temple. Nearly clear, the water carries a toasty sulfur aroma and an alkaline softness that wraps the skin in a slippery smoothness. It suits travelers who want a quiet soak at the gate of an ancient temple.

Sarukura Onsen Mixed Spring combines several hot sources rising in national forest on the southeastern foothills of the Hakkoda range, upstream of the Oirase Stream. Its hot water is piped down to the gorge. A neutral simple spring led by sulfate and calcium, it is gentle on the body and warms walkers chilled by the stream air.

This spring rises on a plateau wrapped in old-growth beech forest at the foot of Mt. Akita-Komagatake, the gateway to Nyuto Onsen. Unlike the milky sulfur springs that dominate the area, it is a brownish bicarbonate water that leaves the skin slippery and smooth, with a faint tart taste and a hint of iron. It is warmed in the deep-snow winter months, and invites a side-by-side comparison with the area's white sulfur waters while you take in fresh green or autumn leaves.

This spring began welcoming bathers in 1964, when the Yamanami Highway opened, on a rise at the center of Kurokawa Onsen. Though light in dissolved minerals, its weakly acidic water at pH 3.7 carries iron, releasing a faint sulfur and metallic note from nearly clear water. It suits travelers who stroll the mountain hot-spring village and want a refreshing soak between baths.

Namari Onsen, said to have opened some 600 years ago, is the single-inn spa of the Hanamaki Minami hot spring area. Legend tells of a white monkey bathing in water welling up at the foot of a katsura tree, remembered in the names of the Katsura-no-yu source and the naturally gushing Hakuen-no-yu rock bath. Fuji San Ryokan, founded in 1841, uses several sources bath by bath. This analysis covers a blend in which the cooler Shimo-no-yu is added to the hotter Katsura-no-yu to reach a comfortable temperature, feeding baths such as Shiraito-no-yu overlooking the Shiraito Falls. The weakly alkaline water feels smooth and invites deep relaxation to the sound of the river.

Meto Onsen was discovered in the Meiji era and opened in 1904 as a secluded inn deep in the Tokachi mountains. The 58°C source flows naturally beside the Nukanan River and is cooled by a heat exchanger, never with added water, before reaching the tubs. Its pH 9.5 alkalinity and carbonate give a distinctly slick, silky feel. Clear with a faint hydrogen-sulfide scent, it suits those who want to soak at leisure surrounded by primeval forest and the sound of the stream.

Tokachigawa Onsen's Moor Onsen is a globally rare plant-derived hot spring, formed as ancient plants accumulated over eons, filtering through lignite layers. Its amber-colored waters, akin to a beauty serum, gently envelop the skin, providing natural moisture and promoting silky skin. Embraced by the magnificent nature of the Tokachi Plain, this gentle warmth, infused with the earth's blessings, fosters deep relaxation and rejuvenation for both mind and body. It is ideal for travelers seeking to escape daily hustle and quietly reset their inner balance.

This private source is located in the renowned Yufuin Onsen, nestled at the foot of Mt. Yufu. Pumped from 200 meters underground, the Yubunosato Ryoso Makibanoie source is a weakly alkaline simple spring with a pH of 8.1. Yufuin has long been cherished as a therapeutic spa town, establishing itself as a tranquil retreat by intentionally avoiding a bustling entertainment district. Embodying this philosophy, the water is exceptionally gentle and kind to the skin. Steeping in these waters allows you to forget the daily hustle and embrace a serene moment, as if held by Yufuin's abundant nature.

This is one of the most well-known sources in Noboribetsu, a leading onsen destination in Hokkaido. It continuously flows at a high temperature of 96.5°C, embodying the raw power of the earth. The highly acidic water, with a pH of 2.2, provides a tingling sensation on the skin and a refreshing feeling after bathing. Its rich iron and sulfate content offers a powerful bathing experience that feels as if it's awakening both mind and body. It's a spring for those who wish to reset from daily fatigue, gain new vitality, and feel nature's energy throughout their entire being.

Known for some 1,700 years and said to be one of Takeda Shingen's hidden baths, Umegashima is a mountain toji village at the head of the Abe River. The city manages the spring and distributes it to the inns. Clear yet scattered with white yunohana, its pH 9.4 alkaline water feels silky and slippery, long praised as a "bath that makes beauties" and ideal for slow, lukewarm soaks.

The Oyado Yuraku Gensen is a private source bubbling up in the central area of Yufuin Onsen, a town known for its idyllic rural landscapes at the foot of Mt. Yufu. Many of Yufuin's springs, a long-cherished health resort area, are classified as simple hot springs gentle on the skin. This source is one of them, characterized by its mild and soft touch. Immersing yourself in its waters feels like being embraced by the serene nature of Yufuin, offering a peaceful respite for resetting mind and body away from daily life.

Hakone Yumoto Onsen, said to have been discovered in the Nara period, is home to Yumoto Onsen No. 3. This source quietly gushes from its location in the deepest part of the area, along the Sugumo River valley. Excavated as a horizontal tunnel during the Meiji period, this naturally gushing spring yields soft, alkaline waters that gently envelop the skin. After a bath, one can expect a feeling of lightness, both in body and mind. It continues to be cherished and utilized by surrounding onsen facilities, beloved by those seeking to quietly restore their body and mind amidst abundant nature.

Opened in 2004, Ohara Onsen in Kyoto's Ohara district offers a colorless, transparent spring nestled in a mountain village near renowned temples like Sanzen-in and Jakkō-in. Its signature feature is a gentle, soft texture that delicately envelops the skin. Immersing yourself in this weakly alkaline, smooth water amidst the ancient capital's tranquility will slowly release tension from your stiff body and mind. This onsen is perfect for those seeking serene moments surrounded by abundant nature, far from the daily hustle.

Uzura Onsen is drawn by pump at 160 liters per minute from a well in the farmland of Uzura-cho, Atsusawabe. A 1994 analysis by the Hokkaido Institute of Public Health classified the source as an alkaline simple spring at 30.0°C and pH 8.5. Clear, odorless and tasteless, it carries sodium, chloride, bicarbonate and 122.7 mg/kg of metasilicic acid, soothing the skin with a quiet, unassuming character that suits this modest farming town in southern Hokkaido.

Gushing forth in the Yufuin Onsen area at the foot of Mt. Yufu, the Yufuin Yubel Hotel No. 1 Spring embodies the town's spirit. Yufuin, one of Japan's most famous hot spring resorts, has a history of avoiding boisterous development, instead cultivating a tranquil retreat where pastoral landscapes meet art. This alkaline simple spring, with its low-irritant properties, is a perfect expression of that philosophy. The soft, pH 8.5 water gently envelops the skin, leaving it feeling smooth and refreshed after bathing. It is a fine spring that offers a peaceful escape for those seeking to unwind both body and soul.

Hakone-Yumoto is said to date back to the Nara period, the oldest of Hakone's seven historic spas. In the Edo period it thrived as a healing stop for travelers on the Tokaido, nestled by the forest of Sounji Temple, linked to the Hojo clan. This source rises at 45.2°C as an alkaline simple spring of pH 8.5, its softly balanced water wrapping the skin in smoothness. Gentle enough for all ages, it is a spring that unwinds city fatigue at the gateway to Hakone.

Rising on its own from a well in Rushin, a quiet valley east of the Tokachi Plain, this spring carries only about 0.2 g of minerals per kilogram, yet its pH of 10.0 ranks among the most alkaline in Hokkaido. Sodium and carbonate dominate, giving the water a slippery, skin-softening feel. The cool spring is warmed for bathing, making it a gentle mountain-village bath for smooth skin.

A local trucking company drilled a well to wash its trucks and struck hot water instead, opening a day-bathing facility in 1999. The No. 1 well flows naturally at 420 L/min. Faintly yellow at the source, it looks like oolong tea in the tub, is almost tasteless with a hint of iron and oily scent, and its mildly alkaline, bicarbonate-based water feels smooth and slippery, recalling the peat-derived moor springs of southern Hokkaido.

Noboribetsu Onsen, Hokkaido's renowned hot spring, often called a 'department store of hot springs,' began its formal history in the Edo period when Takimoto Kinzo established a therapeutic bath. Despite the rugged landscape of 'Jigokudani' (Hell Valley), an explosive crater site said to be home to demons, the waters, a bounty from this earth, are filled with powerful healing. This acidic, sulfur-scented spring water thoroughly cleanses the skin and delivers restorative warmth deep into the body. It is highly recommended for those who wish to feel the energy of nature and experience a dynamic rejuvenation of mind and body.