Arima Onsen is a historic hot spring resort located in Kita Ward, Kobe, Hyogo Prefecture. Renowned for its long history and distinctive mineral-rich waters, it is counted among Japan’s oldest hot spring destinations, alongside Dogo Onsen and Shirahama Onsen. Arima is mentioned in The Pillow Book, a celebrated work of Japanese literature written by Sei Shonagon around the year 1000.
During the Muromachi period (1336–1573), Arima was recognized as one of Japan’s three most famous hot springs, together with Kusatsu Onsen and Gero Onsen. In the Edo period (1603–1868), it received the prestigious rank of West Ozeki in a popular ranking of hot springs. Surrounded by beautiful mountain scenery and located near Setonaikai National Park, Arima Onsen remains one of Japan’s most celebrated destinations for relaxation and cultural discovery.
Arima Onsen lies near the Arima–Takatsuki Tectonic Line, an active fault zone that influences the movement of underground water. Hot spring water rises to the surface through fractured rock formations created by geological activity. Differences in the direction of the faults also contribute to variations in water temperature and mineral composition, giving the area its distinctive range of springs.
Arima Onsen is particularly famous for two types of mineral water known as Kin-sen (Golden Spring) and Gin-sen (Silver Spring). Their contrasting colors and mineral compositions are among the defining features of the resort.
Kin-sen is a mineral-rich chloride spring containing substantial amounts of iron and salt. The water emerges from the ground almost colorless, but turns a distinctive reddish-brown when exposed to air as the iron oxidizes. This unusual color gives the spring its name, meaning “Golden Spring.” Its high mineral and salt content is traditionally associated with helping the body retain warmth and moisture.
Gin-sen refers to two types of colorless, transparent spring water: bicarbonate springs and radon-containing radioactive springs. Bicarbonate spring water is traditionally valued for its refreshing bathing experience and is associated with skin care and relaxation. Radon springs are also part of Arima’s distinctive geothermal environment. Visitors can experience the contrasting qualities of these waters at the town’s public bathhouses.
Arima’s hot spring water is believed to include a mixture of deep-rising water and rainwater-derived water associated with radon springs. One theory suggests that the deep water originates from fluids released by rocks connected with the Philippine Sea Plate as it descends beneath Japan near the Nankai Trough. This water rises through deep geological formations before reaching the surface.
The radon-containing springs, meanwhile, are associated with rainwater that has interacted with the region’s granite, particularly the Rokko Granite. These different geological processes help explain why Arima Onsen has such varied mineral waters in a relatively small area.
Situated on the northern side of the Rokko Mountains, Arima Onsen spreads through a narrow mountain valley at elevations of approximately 350 to 500 meters. Sloping streets are lined with traditional inns, hotels, small shops, and buildings featuring wooden latticework. The historic townscape blends old-fashioned Japanese charm with modern accommodations, creating an inviting atmosphere for a leisurely stroll.
The town’s public bathhouses, including Kin no Yu and Gin no Yu, make it easy for visitors to experience its famous hot spring waters even without staying overnight at a traditional inn.
Kin no Yu is the best-known place to enjoy the reddish-brown waters of Kin-sen. The mineral-rich water is especially appealing in cold weather, when its warmth can be enjoyed long after leaving the bath. Its distinctive color and association with Arima’s history make it a popular stop for visitors exploring the hot spring town.
Gin no Yu uses the clear waters of Gin-sen. Its bicarbonate spring offers a different bathing experience from the Golden Spring, allowing visitors to compare the characteristics of Arima’s two celebrated types of mineral water. It is a relaxing place to unwind after walking through the town’s sloping streets.
Arima Onsen is home to numerous religious and historic sites that reflect its long association with healing, pilgrimage, and traditional Japanese culture. According to local history, the monk Ninsei established the Arima Twelve Monasteries in 1191, helping to revive the hot spring resort and develop facilities for visitors seeking therapeutic bathing. The names of these institutions have survived in the history of the town’s inns and temples.
Other notable religious sites include Onsen-ji Temple, Tosen Shrine, and Myoken-ji Temple. Scattered throughout the hot spring district, these sites offer opportunities to discover Arima’s spiritual heritage alongside its bathing culture.
Arima Onsen preserves traditional ceremonies that celebrate the prosperity of the resort and the well-being of its community. On January 2 each year, the town holds Irisome-shiki, a New Year ceremony praying for the continued prosperity of Arima Onsen and success in business.
Another important tradition is the Kento-shiki, a ceremonial offering of hot spring water at Nishinomiya Shrine, the head shrine of the Ebisu shrine network. These events reflect the close relationship between Arima’s hot springs, local religious traditions, and community life.
Arima Onsen is known for a variety of local specialties, including carbonated rice crackers, steamed carbonated buns, traditional bamboo baskets, and sweets made with black soybeans. These treats and crafts make popular souvenirs for visitors wishing to take home a taste of the town’s culture.
Tansan senbei are among Arima Onsen’s signature sweets. These thin, lightly baked crackers are made using carbonated spring water and have a delicate crunch with a gentle sweetness. Their light texture makes them an ideal accompaniment to tea and a popular souvenir from the hot spring town.
In 1889, British entrepreneur John Clifford Wilkinson discovered a natural carbonated mineral spring in the Arima area. The discovery led to the development of Wilkinson Tansan, a carbonated water brand that remains widely known in Japan. This connection to natural mineral water adds another distinctive chapter to Arima’s history.
Arima Onsen has a history stretching back to ancient times, with references appearing in early Japanese historical and literary works, including the Nihon Shoki and the Shaku Nihongi. According to Japanese mythology, the deities Okuninushi-no-Mikoto and Sukunahikona-no-Mikoto discovered the healing properties of hot spring water while treating injuries.
Historical records also indicate that Emperor Jomei stayed at Arima Onsen in 631. During the Nara period (710–794), the Buddhist monk Gyoki established Onsen-ji Temple, helping to lay the foundations for the resort’s development as a destination for bathing and recovery.
Arima Onsen gained literary recognition through Sei Shonagon’s mention of the resort in The Pillow Book. It also attracted members of the imperial court, including Retired Emperor Go-Shirakawa and Lady Kenreimon-in. In 1192, the monk Ninsei helped restore Arima Onsen after a period of decline, establishing the foundations of the hot spring resort that developed in later centuries.
During the Warring States period (approximately the 15th to 16th centuries), the powerful warlord Toyotomi Hideyoshi became a devoted visitor to Arima Onsen. He visited the resort repeatedly and is credited with supporting improvements to the hot spring facilities, including expanding bathing areas to make them more accessible to ordinary people.
Hideyoshi’s association with the resort remains strong today. Arima is sometimes linked with the name Taiko no Yu, meaning “the hot spring of the Taiko,” a reference to Hideyoshi’s title and his influence on the town’s development.
Near Taiko Bridge, which crosses the Arima River, stands a bronze statue of Toyotomi Hideyoshi, one of the hot spring town’s best-known landmarks. Across the river, Nene Bridge and a statue of Nene, Hideyoshi’s wife, form a symbolic pair with the bridge and statue dedicated to Hideyoshi. Together, these monuments recall the couple’s historical connection with Arima Onsen and make popular stops for photographs.
Tsuesute Bridge, whose name means “Walking Stick Discarding Bridge,” is associated with a local legend about people who discarded their walking sticks after recovering from illnesses through hot spring bathing. The story has given rise to the saying that crossing the bridge brings good health. It is a small but memorable part of the folklore surrounding Arima’s long tradition of therapeutic bathing.
Arima Onsen combines an extraordinary history, distinctive mineral-rich hot springs, traditional streets, and beautiful mountain scenery. From the reddish-brown waters of Kin-sen to the clear waters of Gin-sen, the resort offers a unique bathing experience rooted in centuries of Japanese culture.
Whether you are interested in traditional hot spring bathing, historic temples, local sweets, or simply a peaceful escape in the mountains, Arima Onsen offers a memorable introduction to Japan’s onsen culture. A visit provides the opportunity to experience one of the country’s most enduring and celebrated hot spring destinations.
Bus:
30 minutes from Sannomiya Station → “Arima Onsen” bus stop
Railroad:
35 minutes from Sannomiya to Tanigami by Hokushin Express → “Arima Onsen Station” on Kobe Electric Railway Arima Line