IKI RETREAT by Onko Chishin
Room Types
2
Water
Hot Spring
Private
In-Room Onsen
Cuisine
Kaiseki
About
IKI RETREAT by Onko Chishin is a Michelin 5-Pavilion luxury ryokan on Iki Island, Nagasaki Prefecture, offering 12 ocean-view rooms each with a private open-air bath fed by a 1,700-year-old ultra-high-concentration natural hot spring. A member of Design Hotels and Marriott, the retreat features exquisite kaiseki cuisine starring Iki beef, fresh sea urchin, and abalone, along with holistic wellness programs on an ancient island steeped in Shinto mythology.
Ideal For
Key Experiences
Gallery
Ready to experience IKI RETREAT by Onko Chishin?
See Prices on AgodaRoom Types
Junior Suite with Private Open-Air Hot Spring
Expansive suite with ocean views, a private open-air bath fed by golden mineral spring water, a comfortable living room, and elegant Japanese-Western furnishings.
- Private open-air hot spring bath
- Ocean panoramic views
- Spacious living area
- Japanese and Western furnishings
- Premium bath amenities
- Mini bar and refreshments
Premium Japanese-Style Room with Private Open-Air Hot Spring
Traditional Japanese-style room with premium furnishings, a private open-air bath with ocean views, and a dedicated dining area for in-room kaiseki service.
- Private open-air hot spring bath
- Ocean views
- Traditional tatami areas
- Dedicated dining area
- Premium furnishings
- Picasso and Chagall artwork (premier suite)
Onsen & Baths
Spring Type
Hypertonic sodium chloride spring — ultra-high-concentration golden mineral water (approximately 17x standard onsen mineral levels)
Private Baths
- In-room private open-air ocean-view hot spring bath (all 12 rooms)
Duration: Unlimited (private to each guest room)
Indoor Baths
- Shared indoor mineral bath
Outdoor Baths
- Shared outdoor ocean-view bath
- Wash thoroughly before entering any bath
- Do not bring towels into the bath water
- The source water is extremely hot (69°C) — allow it to cool in your private bath before entering
- Keep conversations quiet in shared bathing areas
- Tie long hair up to keep it out of the water
Dining
Main restaurant (dinner and breakfast)
In-room dining available for select room types
Specialty Dishes
Dietary Options
At least 3 days in advance recommended
Amenities
Premium
Best Times to Visit
Spring (Mar–May)
- Pleasant ocean breezes and comfortable temperatures
- Spring seafood season with excellent fresh catches
- Cherry blossoms on the island add to the scenic beauty
- Book jetfoil tickets early for spring holidays
- Occasional spring rain showers
Summer (Jun–Aug)
- Emerald green seas at their most vivid and beautiful
- Sea urchin season peaks in summer — the freshest uni available
- Swimming and beach activities complement the onsen experience
- Hot and humid — the ocean breezes help
- Typhoon season may affect ferry schedules in late summer
Autumn (Sep–Nov)
- Comfortable temperatures perfect for outdoor bathing
- Autumn kaiseki ingredients at their seasonal peak
- Fewer crowds than summer
- Early autumn typhoons may still affect ferry services
- Book well in advance for autumn weekends
Winter (Dec–Feb)
- Dramatic winter seascapes and powerful ocean views
- Hot spring bathing is especially rewarding in cold air
- Winter seafood including rich, fatty fish varieties
- Rough seas may affect ferry schedules — check before booking
- Cold ocean winds — bring warm layers for outdoor exploration
- Shorter daylight hours
Local Knowledge
Insider Tips
Hidden Gems
- The hot spring water is hypertonic with approximately 17 times the mineral concentration required for onsen classification
- Iki beef is an extremely rare wagyu variety raised on the island, often considered a predecessor to Matsusaka beef
The premier suite is adorned with original Picasso and Chagall paintings
Iki Island has nearly 1,000 shrines and altars total, making it one of the most spiritually dense places in Japan
Must-Try Experiences
- A kaiseki dinner featuring all three Iki Island treasures: sea urchin, abalone, and Iki beef
- Bathing in the golden, mineral-rich hypertonic spring water renowned as a rare beauty-enhancing onsen
Visiting Iki's ancient Shinto shrines — the island has over 150, some dating back millennia
Experience Tips
- Allow your private bath to cool from the 69°C source temperature before entering — patience is rewarded
- Ask the concierge to arrange an island shrine tour to explore Iki's ancient spiritual heritage
Try all three island delicacies in one kaiseki sitting: sea urchin, abalone, and Iki beef
Take time for the spa and yoga programs to fully embrace the island wellness experience
Explore the coastline — the emerald green waters rival Okinawa in beauty
Cultural Notes
- Iki Island appears in Japan's oldest historical records and 3rd-century Chinese chronicles as an important waypoint between Japan and mainland Asia
- The island's over 150 shrines and nearly 1,000 altars reflect its deep Shinto spiritual significance
Yunomoto Hot Springs have been revered for 1,700 years, traditionally associated with fertility
Iki beef traces its lineage back centuries and is considered an ancestor breed of famous Matsusaka wagyu
Ready to experience it yourself?
Check Availability & Book on AgodaPractical Information
Stay Details
Recommended Stay
2-3 nights
Getting There
- Jetfoil from Hakata Port, Fukuoka (approximately 1 hour)
- Large ferry from Hakata Port (approximately 2 hours)
- Direct flight from Nagasaki Airport (approximately 30 minutes)
- Complimentary shuttle between Iki ports/airport and the retreat (advance reservation required)
- Ferry from Karatsu Higashi Port, Saga Prefecture
Before You Go
Dietary Options
At least 3 days in advance recommended
Booking Tips
- Book well in advance — only 12 rooms available in this Michelin-recognized property
- Reserve the complimentary shuttle service when booking (required in advance)
- Marriott Bonvoy members may earn points through the Design Hotels partnership
- Request the premier suite for original Picasso and Chagall artwork
- Coordinate jetfoil or flight timing with the shuttle service for seamless arrival
Preparation Tips
- Book jetfoil tickets from Hakata Port in advance during peak seasons
- Pack lightly — island atmosphere is casual and yukata are provided
- Check weather and sea conditions as ferries may be affected by rough seas
- Bring sunscreen and light clothing in summer — Iki has a surprisingly tropical climate
- Cash is useful for exploring the island independently
Quick Facts
Nearest Station
Hakata Port (Fukuoka) — jetfoil to Iki Island
History
Iki Island was described in 3rd-century Chinese historical records and is considered the fifth island created by the gods in Japanese mythology. The island is home to over 150 Shinto shrines, 280 kofun burial mounds, and the ancient Harunotsuji settlement — one of the largest Yayoi-period sites discovered in Japan. IKI RETREAT's Yunomoto Hot Springs have been treasured for over 1,700 years and are traditionally associated with fertility and healing. The property was recognized in the Michelin Guide Fukuoka, Saga, Nagasaki 2019 as a 5-Pavilion ryokan (the highest luxury designation).
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