Inunakiyama Onsen is a hot spring area in Ogi, Izumisano City, Osaka Prefecture. The area was formerly known simply as “Inunaki Onsen.” Several traditional Japanese inns are scattered along the upper reaches of the Kashii River, centered around a natural hot spring bathing facility known as Yama-no-Yu.
Inunakiyama Onsen is the only hot spring village in Osaka Prefecture. The surrounding mountains have a history of more than 1,300 years as a center of Shugendo, a Japanese mountain ascetic tradition.
The mountain area is also associated with the Legend of the Faithful Dog, traditionally said to date back to around 960. The combination of hot springs, deep forests, waterfalls, and religious history gives the area a distinctive atmosphere.
Inunakiyama Onsen is also located close to Kansai International Airport and is sometimes described as a hot spring village “closest to the world.” Its convenient access makes it popular with both domestic and international visitors looking for a peaceful mountain retreat near the airport.
The hot spring water at Inunakiyama Onsen is classified as a sodium-bicarbonate spring, with a mildly alkaline character and a relatively low temperature. It is also described as a pure sodium bicarbonate spring.
The spring temperature is relatively cool, ranging from approximately 16°C to 20°C. Traditionally, bathing in the waters has been associated with benefits for conditions such as:
Rheumatism
Neuralgia
Digestive disorders
Skin conditions
Skin-beautifying effects
Inunakiyama is a mountainous area centered around the Inunaki River Gorge in Izumisano City. The area is part of the Kongo-Ikoma-Kisen Quasi-National Park.
The scenery along the mountain streams has also been selected as one of the 100 Best Green Landscapes of Osaka Prefecture.
The mountains are home to numerous waterfalls, including the Seven Great Waterfalls, as well as approximately 48 waterfalls of various sizes.
Among them, Gyōja Falls is particularly famous as a site for Shugendo ascetic practices. Visitors can also participate in a one-day Shugendo experience, although advance reservations are required.
The name Inunakiyama, literally meaning “Dog-Crying Mountain,” is linked to a traditional legend about a faithful dog that confronted a giant serpent in order to protect its master.
The story is said to have moved the emperor, who subsequently granted a temple the mountain name Inunakiyama. The legend has become an important part of the area’s cultural identity.
Inunakiyama is home to Shipporyuji Temple, the head temple of the Inunakiyama school of Shingon Buddhism. The temple is traditionally said to have been founded in 661 by En no Ozunu, the legendary founder of Shugendo.
The temple has long served as an important center of the Katsuragi Shugendo tradition and has attracted religious practitioners and pilgrims for centuries.
Inunakiyama played an important role as a principal training ground for Katsuragi Shugendo. During the Nanboku-cho period, Buddhist practitioners stayed in the mountains to undertake ascetic training, and the area reached the height of its prosperity during the Muromachi period.
The religious community later suffered a period of decline after the area was affected by warfare during the time of Toyotomi Hideyoshi. It was subsequently rebuilt and eventually developed into the mountain sanctuary seen today.
From Izumisano Station on the Nankai Main Line or Hineno Station on the JR Hanwa Line, take a Nankai Wing Bus bound for Inunakiyama. The journey takes approximately 20 minutes.
Inunakiyama can also be reached by Wakayama Bus Naga from Kumatori Station on the JR Hanwa Line or Kokawa Station on the JR Wakayama Line.
By car, use Osaka Prefectural Road / Wakayama Prefectural Road 62, the Izumisano-Uchita Line.
Inunakiyama is located southeast of Kansai International Airport, close to the border with Wakayama Prefecture.
Inunakiyama Onsen offers a unique combination of traditional hot spring bathing, mountain scenery, waterfalls, and more than 1,300 years of Shugendo history.
Visitors can relax in the hot springs while exploring a sacred mountain landscape that has been shaped by legends, religious traditions, and rich natural surroundings.
For travelers looking to discover a quieter side of Osaka beyond the major urban attractions, Inunakiyama Onsen provides an opportunity to experience the prefecture’s mountain culture and natural beauty. Its proximity to Kansai International Airport also makes it a convenient destination to include in a trip to the Osaka area.