Katsuura Onsen, Wakayama Prefecture Complete Guide｜A Journey Through 175 Hot Spring Sources and Spectacular Cave Baths
Katsuura Onsen, located in Nachi-Katsuura Town, Higashimuro District, Wakayama Prefecture, is a hot spring resort renowned for its particularly abundant hot spring resources among the hot springs of Wakayama Prefecture, known as “Kishuu, Land of Hot Springs.” With 175 diverse hot spring sources—the most in the prefecture—flowing from the ground, centered around Nanki Katsuura Onsen and Yukawa Onsen, the area features a wide variety of hot spring facilities ranging from large hotels to charming traditional inns and easily accessible public bathhouses.
Facing the beautiful coastline of Kumano Bay with picturesque scenery of large and small islands called Kii Matsushima floating in the water, the greatest charm of Katsuura Onsen is the opportunity to enjoy hot springs with different mineral compositions from each source. Access to the Kumano Kodo pilgrimage trail and Nachi Falls, both part of the UNESCO World Heritage site “Sacred Sites and Pilgrimage Routes in the Kii Mountain Range,” is excellent, making it possible to enjoy a fulfilling trip combining hot springs and sightseeing.
History and Culture of Katsuura Onsen
The history of Katsuura Onsen is ancient, with the oldest record appearing in the “Shingu Domain Memorandum” from around 1707, which mentions “Akashima Onsen at the water’s edge.” This description shows that the area was known as a hot spring resort more than 300 years ago.
During the Edo period, it was used as a hot spring bathing resort by pilgrims visiting Kumano shrines and developed as an important hot spring resort in the southeastern part of Kii Peninsula. From the Meiji period onward, with improvements in transportation networks, development as a tourist destination progressed, and from the Showa period, construction of large hotels followed one after another, establishing the foundation of the current hot spring town.
In recent years, following UNESCO World Heritage designation, the number of domestic and international tourists has increased, and the resort continues to evolve while preserving traditional hot spring culture and providing modern services.
Spring Quality and Benefits of Katsuura Onsen
The greatest characteristic of Katsuura Onsen is its 175 hot spring sources, the most in the prefecture. Since each source has different mineral composition, various hot springs can be experienced depending on the accommodation facility.
Main Spring Types
Sodium-chloride springs are the most common, reflecting the location near the sea with salt-containing hot water. After bathing, salt adheres to the skin, providing high heat retention effects and is also called “hot spring of heat.” It is said to be effective for neuralgia, muscle pain, joint pain, and cold sensitivity.
Sulfur-containing springs are found in some sources, characterized by a distinctive sulfur smell. They are said to have benefits for skin conditions, chronic gynecological diseases, and arteriosclerosis.
Simple hot springs are mild and gentle on the skin, suitable for fatigue recovery and health promotion.
Benefits of Hot Springs
The main benefits of Katsuura Onsen are as follows:
- Neuralgia, muscle pain, joint pain: The thermal effect of hot springs promotes blood circulation, alleviating pain
- Cold sensitivity and peripheral circulation disorders: The heat retention effect of chloride springs warms the body thoroughly
- Chronic digestive disorders: The relaxation effect of hot spring bathing regulates the autonomic nervous system
- Fatigue recovery and health promotion: The synergistic effect of hot spring components and thermal effects relieves fatigue
- Chronic skin conditions: Hot spring components act on the skin, with improvement in symptoms expected
Many facilities provide hot springs at 100% source concentration, allowing guests to enjoy pure hot springs without any filtration or circulation processing.
Recommended Hot Spring Facilities in Katsuura Onsen
The Katsuura Onsen area features distinctive hot spring accommodations scattered throughout. Detailed information about each facility’s characteristics is provided below.
Hotel Urashima
A large hot spring resort hotel representative of Katsuura Onsen. Its greatest feature is two cave hot springs, “Boukaikaido” and “Genbukaido,” created using natural caves formed by erosion from the rough waves of Kumano Bay.
Boukaikaido is a massive natural cave measuring 25m in width, 50m in depth, and 15m in height, where guests can bathe while viewing the spectacular Kumano Bay scenery spread before them. Named from the meaning “so wonderful you forget to go home,” this hot spring is an iconic symbol of Katsuura Onsen.
The 100% source hot water undergoes no filtration or circulation processing, allowing guests to enjoy completely natural hot springs. Access to the hotel is via a dedicated shuttle boat, making the boat ride itself a special experience.
Aoki Shima no Yado Kumano Bettei Nakanoshima
A “hot spring inn on an island” located on an island floating in Katsuura Bay. A five-minute ride via exclusive boat from a pier approximately six minutes on foot from Kii-Katsuura Station, guests are drawn into a non-everyday space.
The entire island is the accommodation facility, allowing guests to spend quiet time surrounded by the sea. The open-air bath offers expansive views of Kumano Bay, with particularly spectacular views at dusk. The open-air bath utilizing the island setting provides a sensation of becoming one with the sea.
TAOYA Nachi-Katsuura
A hot spring resort hotel with modern facilities and comprehensive services. The large bath overlooks Katsuura Bay, with the night view being particularly renowned.
The facility features multiple bathhouses with different atmospheric hot springs. Meals are served buffet-style, featuring fresh raw tuna, a specialty of Nachi-Katsuura, as well as abundant seafood and mountain delicacies from Kishuu.
The facility accommodates a wide range of visitors from families to couples to groups, providing comfortable hot spring stays.
Ryori Ryokan Manseiro
An established traditional Japanese inn with a long history since its founding, combining traditional atmosphere with fine-tuned service that has earned a reputation.
The inn places particular emphasis on cuisine, with kaiseki dinners using fresh seafood from Katsuura Port being exceptional. Fresh tuna is a specialty of Nachi-Katsuura, delivered fresh each morning from the port.
Hot springs are provided with direct source flow. While the bathhouse is modest in scale, quality hot water can be enjoyed. Recommended for those wishing to spend relaxed time in a peaceful atmosphere.
Maguro to Jizake no Yado Minshuku Wakatake
A guesthouse-style accommodation with an atmosphere of warmth and friendliness. As the name suggests, the inn focuses on tuna dishes and local sake, offering authentic hot springs and meals at reasonable prices.
Nachi-Katsuura is one of Japan’s premier fresh tuna ports, and tuna dishes made with fresh fish are provided with volume and pricing unique to a small inn. While small-scale, the hot spring uses source water, allowing guests to enjoy bathing in an unpretentious atmosphere.
Kame no I Hotel Nachi-Katsuura
A facility of the nationwide Kame no I Hotel group, offering consistent service and facilities. Located on a high ground overlooking Katsuura Bay, it features excellent views.
The large bath overlooks Katsuura’s townscape and sea, with particularly stunning views during sunrise. The facility maintains clean, comfortable environments where guests can stay with confidence.
Access to nearby attractions is also good, making it convenient as a base for visiting Nachi Falls and Kumano Kodo.
Hana Irodori no Yado Hanayuu
A hot spring inn with the concept “Journey to UNESCO World Heritage Kumano Kodo and Fine Cuisine.” The interior is decorated with flower-themed décor, creating an elegant atmosphere.
The hot spring uses quality sources from Katsuura Onsen, with an open-air bath overlooking lush scenery. Cuisine features creative kaiseki using local ingredients, characterized by beautiful presentation that pleases the eye.
Popular with women, the inn is renowned for its attentive service and hospitality.
Kyukamura Nanki-Katsuura
A public accommodation facility operated as a national inn, offering hot springs and leisure at reasonable prices. Located on high ground overlooking Katsuura Bay, it features open views.
The large bath is spacious, allowing families to bathe comfortably. Meals are served buffet-style with dishes using local ingredients.
Walking trails surround the facility, allowing nature walks as well. Suitable for families and group use.
Day-Tripper Hot Spring Facilities
Hot spring facilities that allow visitors to enjoy Katsuura Onsen without staying overnight are also well-developed.
Nishiki no Yu
A public bathhouse operated by Nachi-Katsuura Town, uniquely located at JR Kii-Katsuura Station. Opening in 2015, it has become popular as a convenient hot spring to visit while traveling.
From the spacious bath, guests can view Katsuura’s blue sea, enjoying the sea’s sparkle by day and Katsuura’s nightscape in the evening. The spring type is sodium-chloride, perfect for soothing travel fatigue.
Fees are reasonable, and the facility is beloved by local residents. Towels and amenities are available for purchase, making it possible to visit without prior preparation.
Other Day-Tripper Bathing Facilities
Many hot spring hotels and traditional inns also accept day-trippers. Plans allowing day-trip enjoyment of Boukaikaido at Hotel Urashima and the open-air baths at various inns are available, allowing visitors to enjoy hot spring hopping.
Some facilities require advance reservations, so it’s recommended to confirm with each facility before visiting.
Access to Katsuura Onsen
Methods of accessing Katsuura Onsen are introduced below.
Access by Train
JR Kisei Main Line “Kii-Katsuura Station” is the nearest station.
- From Osaka: Limited express “Kuroshio” from JR Osaka Station takes approximately 3 hours 30 minutes
- From Nagoya: Limited express “Wide View Nanki” from JR Nagoya Station takes approximately 3 hours 30 minutes
- From Shin-Osaka Station: Limited express “Kuroshio” takes approximately 3 hours 20 minutes
From Kii-Katsuura Station, some inns are within walking distance, while others operate shuttle buses or shuttle boats. From the station to the pier is approximately 6 minutes on foot, from which boats transport guests to inns such as Hotel Urashima and Nakanoshima.
Access by Car
- From Osaka area: Via Hanwa Expressway and Kisei Expressway, approximately 3 hours 30 minutes
- From Nagoya area: Via Tomei Expressway, Ise Expressway, and Kisei Expressway, approximately 3 hours 30 minutes
“Susami-Minami IC” on the Kisei Expressway is the nearest interchange, from which it takes approximately 50 minutes via National Route 42.
All accommodation facilities have parking lots, making car visits convenient.
Access by Airplane
Nanki-Shirahama Airport is the nearest airport. A flight from Tokyo (Haneda Airport) takes approximately 1 hour, with the airport to Katsuura Onsen accessible by rental car or bus in approximately 1 hour 30 minutes.
Sightseeing Spots Around Katsuura Onsen
When visiting Katsuura Onsen, be sure to visit nearby sightseeing spots.
Nachi Falls
One of Japan’s three most famous waterfalls registered as part of the UNESCO World Heritage site “Sacred Sites and Pilgrimage Routes in the Kii Mountain Range.” This magnificent waterfall with a 133m drop has been an object of faith since ancient times.
Approximately 15 minutes by car from Katsuura Onsen, also accessible by bus. It is customary to visit together with Nachi-san Seigantoji Temple and Kumano Nachi Taisha.
Kumano Kodo
A pilgrimage trail registered as a UNESCO World Heritage site, with multiple routes available in the Katsuura Onsen area. Particularly notable is “Daimon-zaka” with beautiful stone-paved ancient trails and about 600m of walking through cedar groves, enjoyable even for beginners.
A perfect tourism plan is realized by hiking the ancient roads followed by enjoying the hot spring to relieve fatigue.
Kii Matsushima Tour
A sightseeing pleasure boat tour around the large and small islands floating in Katsuura Bay. A 40-minute cruise allows viewing of peculiar rocks and strange stones such as Camel Rock and Lion Rock from the sea.
Departing from a pier approximately 5 minutes on foot from Kii-Katsuura Station, guests can enjoy Katsuura Onsen’s seascapes from the sea.
Whale Watching and Dolphin Swimming
The waters off Nachi-Katsuura Town are known as an area where whales and dolphins migrate. Particularly from spring through fall is the best season for whale watching, offering high probability of whale encounters.
Additionally, in nearby Taiji Town, the popular experience of swimming with wild dolphins is available.
Taiji Town Museum of Whales
A museum located in the adjacent Taiji Town where visitors can learn about whale ecology and the history of whaling. Dolphin and whale shows are held, making it popular with families.
Approximately 10 minutes by car from Katsuura Onsen with good access.
Katsuura Fishing Port
Known as one of Japan’s premier fresh tuna ports, where tuna auctions are held each morning (viewing has restrictions).
The area surrounding the port features fresh seafood restaurants and souvenir shops, with the morning market particularly lively.
Ways to Enjoy Katsuura Onsen
Enjoy Hot Spring Hopping
With 175 sources each with different mineral compositions, “hot spring hopping” is recommended at Katsuura Onsen. Many facilities accept day-trippers, allowing multiple hot springs to be experienced in a day.
Particularly, hopping between the cave hot spring Boukaikaido, the island hot spring Nakanoshima, and the station-side hot spring Nishiki no Yu, each with distinctive characteristics, allows experiencing the diversity of Katsuura Onsen.
Savor Seafood Delicacies
Nachi-Katsuura Town is one of Japan’s premier fresh tuna ports. In particular, bluefin tuna boasts the highest landing volume in Japan, and enjoying fresh raw tuna is a major attraction of Katsuura Onsen.
Tuna sashimi, tuna rice bowls, tuna collar grilled—various preparations of tuna dishes are exceptional. Additionally, seasonal seafood such as bonito, mackerel, and spiny lobster are abundant.
Combining World Heritage Sites and Hot Springs
Katsuura Onsen is located at the gateway to the UNESCO World Heritage site “Sacred Sites and Pilgrimage Routes in the Kii Mountain Range.” Visitors can combine world heritage tourism with hot springs, such as hiking Kumano Kodo followed by relaxation at a hot spring inn, or visiting Nachi Falls before staying at a hot spring resort.
There is a history of pilgrims to Kumano shrines taking hot spring baths for health during the ancient period, a tradition that can be experienced today.
Enjoy Spectacular Views
Most hot spring facilities in Katsuura Onsen are located in spectacular settings overlooking the beautiful Kumano Sea. Particularly at sunrise and sunset times, the luxury of soaking in a hot spring while watching the ever-changing colors of sky and sea can be experienced.
The scenery of islands floating in the area called Kii Matsushima is one of Japan’s representative beautiful coastal landscapes.
Seasonal Attractions of Katsuura Onsen
Spring (March–May)
A season with mild climate and comfortable weather. Cherry blossoms bloom early, with viewing possible from late March through early April. Whale watching season begins, and sea activities become available.
Summer (June–August)
Beach swimming season, with beaches around Katsuura Bay busy. Dolphin swimming, snorkeling, and other marine activities are abundant. The summer Kumano Sea is particularly blue and beautiful, with exceptional views from open-air baths.
Autumn (September–November)
Stable climate making this the best tourism season. Fall foliage is beautiful, and hiking Kumano Kodo is ideal. Autumn flavors are abundant, with particularly delicious seasonal seafood such as mackerel and bonito.
Winter (December–February)
While South Kii is relatively warm, winter is a quiet season. This season allows hot springs to be enjoyed even more, with the pleasant contrast between cold outside air and warm hot springs. The winter sea presents a wild appearance, offering impressive scenery.
Tips for Selecting Accommodation Plans at Katsuura Onsen
Selection Based on Budget
Katsuura Onsen offers accommodation facilities at various price points. Ranging from large resort hotels to traditional inns, guesthouses, and public inns, facilities can be selected based on budget.
Generally, one night with two meals costs approximately 8,000–12,000 yen at guesthouses and public inns, 15,000–25,000 yen at mid-sized traditional inns, and 25,000 yen or more at luxury inns and resort hotels.
Selection Based on Hot Spring Characteristics
For cave hot spring experiences, Hotel Urashima is recommended; for island hot springs, Nakanoshima; for convenience near the station, accommodations near Nishiki no Yu are suitable.
Selection Based on Meal Content
For those wishing to emphasize tuna dishes, “Maguro to Jizake no Yado Minshuku Wakatake” or “Ryori Ryokan Manseiro” are recommended. For enjoying various cuisines in buffet style, “TAOYA Nachi-Katsuura” or “Kyukamura Nanki-Katsuura” are recommended.
Selection Based on Access Method
For car visits, select inns with complete parking, for train visits, select inns near the station or offering shuttle service. Inns accessed by boat offer special experiences but require caution with large luggage.
Katsuura Onsen and Surrounding Hot Springs
Wakayama Prefecture features many hot spring resorts besides Katsuura Onsen.
Ryujin Onsen
Known as one of Japan’s three most beautiful hot springs, located approximately 2 hours by car into the mountains from Katsuura Onsen. Popular for its beauty-enhancing skin effects.
Shirahama Onsen
A major hot spring resort representative of the Kansai region, approximately 1 hour 30 minutes by car from Katsuura Onsen. Visitors can enjoy the beautiful Shirarahama Beach along with hot springs.
Kushimoto Onsen
A hot spring located at Japan’s southernmost point, approximately 40 minutes by car from Katsuura Onsen. Features warm climate influenced by the Kuroshio Current and beautiful sea.
Kawayuonsen and Watasenonsen
Hot spring resorts near Kumano Hongu Taisha, approximately 1 hour 30 minutes by car from Katsuura Onsen. Kawayuonsen is famous for hot springs welling from the river bottom, while Watasenonsen features western Japan’s largest open-air bath.
Planning a Katsuura Onsen Trip and Helpful Tips
Recommended Length of Stay
For sufficient enjoyment of Katsuura Onsen and surroundings, 2 nights and 3 days are recommended. An ideal itinerary includes relaxing in hot springs on day one after arrival, visiting Nachi Falls or hiking Kumano Kodo on day two, and experiencing Kii Matsushima tours or whale watching on day three.
While major hot springs and attractions can be visited in 1 night and 2 days, 2 or more nights are recommended for a leisurely pace.
Reservation Timing
Popular inns, particularly on weekends, holidays, and summer vacation periods, fill up quickly. Reservations 2–3 months in advance are recommended.
Weekday reservations are relatively easier to obtain, with more reasonable-priced plans available, making weekday visits worth considering if schedules allow flexibility.
Luggage and Clothing
In addition to basic hot spring trip necessities, if planning to hike Kumano Kodo, prepare comfortable shoes, appropriate clothing, hat, and beverages. In summer, sun protection and insect repellent are necessary.
Most inns provide yukatas and towels, though those with preferences may bring personal towels.
Interaction with Local People
One charm of Katsuura Onsen is the warm hospitality of local people. At guesthouses and small inns, conversations with innkeepers and staff are enjoyable. Local recommendations and information about good restaurants not found in guidebooks can often be obtained.
Summary
Katsuura Onsen in Nachi-Katsuura Town, Wakayama Prefecture, is a fascinating hot spring resort boasting 175 hot spring sources—the prefecture’s most abundant—where guests can enjoy diverse hot springs while viewing Kumano Bay’s spectacular scenery. Unique hot springs found only here, such as the natural cave hot spring “Boukaikaido,” island hot springs, and station bathhouse hot springs, are fully available.
As the gateway to the UNESCO World Heritage site “Sacred Sites and Pilgrimage Routes in the Kii Mountain Range,” access to sightseeing spots such as Nachi Falls and Kumano Kodo is excellent, allowing fulfilling trips combining hot springs and sightseeing. Fresh seafood from one of Japan’s premier tuna ports is another major attraction.
Accommodation facilities range from large resort hotels to charming traditional inns and reasonably-priced guesthouses, allowing selection based on budget and purpose. Well-developed day-tripper hot spring facilities make casual visits convenient.
Easily accessible from both the Kansai and Chubu regions, Katsuura Onsen is ideal for weekend trips. Consider planning an enriching hot spring vacation hopping between hot springs with different mineral compositions, visiting world heritage sites, and savoring fresh seafood.
Experience a special time of physical and mental refreshment at Katsuura Onsen, representative of Kishuu, Land of Hot Springs.
