【Complete Guide】The World of Castle in the Sky Laputa! Thorough Explanation of How to Get to Sarushima Island, Kanagawa Prefecture, and Its Highlights
The uninhabited island of “Sarushima” floating in Tokyo Bay has recently garnered significant attention primarily on SNS as a mystical spot where you can experience the world of Studio Ghibli’s masterpiece “Castle in the Sky Laputa.” Despite being only a 10-minute ferry ride from Yokosuka Port, the moss-covered fortress ruins and the fantastical landscape created by enchanting tunnels offer an extraordinary experience as if you’ve wandered into a movie.
This article thoroughly explains everything you need to know before visiting Sarushima, including its appeal, access methods, highlights, history, ways to enjoy it, and nearby tourist attractions.
What is Sarushima? The Appeal of Tokyo Bay’s Only Natural Island
Tokyo Bay’s Largest Natural Uninhabited Island
Sarushima is an uninhabited island located in Yokosuka City, Kanagawa Prefecture, with a circumference of approximately 1.6 km and an area of approximately 0.055 square kilometers. While Tokyo Bay has multiple artificial islands, Sarushima is a precious existence as the only natural island in Tokyo Bay.
Although the elevation is only about 40 meters, the entire island is covered with abundant nature, maintaining a pristine atmosphere that seems unbelievable for a location only about an hour away from central Tokyo. The broad-leafed evergreen forest, with lush trees such as Machilus thunbergii, Castanopsis sieboldii, and Pittosporum tobira, is truly worthy of being called a treasure trove of nature.
Why Is It Called “Laputa”?
The reason Sarushima is compared to “Castle in the Sky Laputa” lies in the ruins of a former Japanese military fortress that remain on the island from the Meiji to early Showa period.
Over the passage of years, the brick structures and stone walls have become densely covered with green moss, with tree roots and vines clinging to them as nature reclaims them, which overlaps with the aesthetic of ruins in Ghibli works. Particularly, the cutting and tunnels in the central part of the island have become fantastical spaces with dappled sunlight, inviting visitors into the world of the film.
Photos posted on SNS with hashtags such as “#SarushimaLaputa” and “#SarushimaGhibli” became topics of discussion, and it has now become a popular tourist spot visited by over 150,000 people annually.
The History of Sarushima: From a Fortress Island to a Tourist Destination
Military Use Beginning in the Edo Period
The military use of Sarushima dates back to the late Edo period. In 1847 (Koka 4), the Edo shogunate installed a battery (gun emplacement) on Sarushima to protect Edo from the threat of foreign ships. This became the first step in Sarushima becoming fortified.
Full-Scale Fortification in the Meiji Period
With the arrival of the Meiji period, the military importance of Sarushima increased further. In 1881 (Meiji 14), full-scale fortress construction began, and under the guidance of French engineers, a state-of-the-art Western-style fortress was built.
Brick barracks, ammunition magazines, cannon emplacements, power plant ruins, and more were successively constructed to function as an important defensive position for Tokyo Bay. A cutting and tunnel spanning approximately 1 km were excavated on the island, and these still retain their original state today.
The Pacific War and Postwar Period
During the Pacific War, Sarushima served as an important part of the Tokyo Bay fortress. However, with the end of the war in 1945, it ceased its role as a military facility and was placed under U.S. military administration for a time.
After being returned to Japan in 1961, Yokosuka City undertook improvements, and public access began the following year in 1995. It is now “Sarushima Park,” a precious tourist spot where visitors can enjoy both historical heritage and natural environment.
The Origin of the Island’s Name
There are various theories about the origin of the name Sarushima. The most famous theory is based on a legend that when the Buddhist priest Nichiren was traveling from Boso to Kamakura, he encountered a storm and was guided by a white monkey to take refuge on this island. There is also a theory that the island’s shape resembles a monkey, but the definitive origin remains unclear.
Access to Sarushima: 10-Minute Ferry from Yokosuka
Access to the Ferry Terminal
To reach Sarushima, take a ferry from the “Mikasa Pier” in Yokosuka City. Access to Mikasa Pier is as follows:
By Train:
- Approximately 15 minutes walk from Keikyu Line “Yokosuka Chuo Station”
- Approximately 20 minutes walk from JR Yokosuka Line “Yokosuka Station,” or about 5 minutes by bus
By Car:
- Approximately 10 minutes from “Yokosuka IC” on the Yokohama-Yokosuka Expressway
- Parking: Paid parking available around Mikasa Park (public transportation recommended as it gets crowded on holidays)
Ferry Operating Information
Operating Company: Triangle Co., Ltd.
Travel Time: Approximately 10 minutes
Operating Season: March to November (closed in winter December to February)
Operating Hours:
- March to November: approximately 8:30 to 17:00 (varies by season)
- Service every 30 minutes to 1 hour
- Final departure time varies depending on the period; please confirm
Fares (as of 2024):
- Adults (junior high school and older): Round-trip 2,000 yen
- Elementary school children: Round-trip 1,000 yen
- Preschool children: Free
- Admission included in the fare
Reservations: Generally no reservations needed (same-day tickets only). However, early arrival is recommended during peak seasons.
Important Notes:
- Service may be suspended due to weather
- Expect crowding in summer and during Golden Week
- Always check the latest operating information on the official website
Length of Stay on the Island
With a round-trip ferry ticket purchased, you can return on any departure you choose. Allow at least 1.5 to 2 hours for exploring the island. If you plan to enjoy barbecue or swimming, a half-day to full-day stay is recommended.
Highlights of Sarushima: Experience the World of Laputa
1. Cutting and Brick Tunnel (The Main Attraction)
The highlight of Sarushima is undoubtedly the cutting and brick-built tunnel that remain in the central part of the island.
This tunnel, excavated in the Meiji period, extends approximately 90 meters and is characterized by beautiful brick construction using a method called French bond. Even during the day, the interior of the tunnel is dimly lit, with cool air flowing through.
When you emerge from the tunnel, a cutting appears with high stone walls on both sides. These stone walls are covered entirely with green moss, with tree roots and vines intricately intertwined, evoking the ruins scenes of “Castle in the Sky Laputa.”
The dappled sunlight changes appearance depending on the time of day, and particularly in the morning when soft light streams in, the scenery is fantastical and ideal for photography.
2. Fortress Ruins Complex
Multiple fortress ruins are scattered throughout the island.
Ammunition Magazine Ruins: A sturdy brick structure that speaks to the durability of the military facilities of the time. Internal access is prohibited, but you can appreciate its scale from the exterior.
Barracks Ruins: The remains of buildings where soldiers lived. Parts of the stone walls remain, allowing you to imagine life at that time.
Cannon Emplacement Ruins: The location where cannons were positioned. Currently, only the foundation remains, but you can understand the strategically important location overlooking Tokyo Bay.
Power Plant Ruins: A facility that supplied electricity within the fortress. The brick building still stands today.
These ruins are free to view, but some areas are deteriorating, so be careful never to enter areas marked as off-limits.
3. Views from the Observation Deck
Near the highest point of the island is a viewing area where you can enjoy wonderful views of Tokyo Bay. On clear days, you can see the Yokosuka cityscape, the Boso Peninsula, and even Mount Fuji in the distance.
The scenery of a maritime city spreads before you, including ships traversing the sea and the distant Yokosuka military port visible in the distance.
4. Nature of Sarushima: Flora and Fauna
Sarushima is also a treasure trove of nature. Over 200 species of plants grow naturally on the island, presenting different faces throughout the seasons.
Spring: Violets and camellias bloom, and fresh greenery is beautiful
Summer: Broad-leafed evergreen forests grow lush, the greenest period of the year
Autumn: Trees begin to change color, presenting a subdued atmosphere
Additionally, you can observe wildlife such as lizards and birds throughout the island. Exploring while enjoying nature observation is also recommended.
5. Beach Area
On the eastern side of Sarushima is a sandy beach where you can enjoy swimming and barbecuing during the summer months. The clear seawater and white sand create a beauty that seems impossible near the metropolitan area.
During the summer season, beach houses open with facilities including showers, restrooms, and food service.
Ways to Enjoy Sarushima and Activities
Island Exploration and Guided Tours
Free Exploration: The island has well-maintained trails for free exploration. The tour takes approximately 1 to 1.5 hours.
Professional Guided Tours: Paid guided tours led by “Sarushima Park Professional Guides” are also offered (reservations required). You can gain a deeper understanding of Sarushima while listening to detailed explanations of its history and nature. The fee is approximately 500 yen for adults.
Best Photography Spots
Sarushima is full of photogenic locations.
- Inside the brick tunnel: The light at the end of the dark tunnel is beautiful
- Moss-covered walls of the cutting: The definitive Laputa-like photo spot
- Stone walls covered with ivy: The fusion of nature and human structure is artistic
- Backlit exit of the tunnel: You can take dramatic silhouette photos
- Seascape from the observation deck: Beautiful contrast between blue sea and sky
Photography Tips:
- Soft morning light is recommended
- Tunnels are dark, so use night mode if using a smartphone
- Avoid using tripods during crowded times
Barbecue (Summer Only)
During the summer, you can enjoy barbecue in the beach area.
Usage Period: July to August
Reservations: Advance reservations required (via official website)
Fee: 3,000 yen or more per person for equipment rental and food sets
Note: Open fires are permitted only in designated areas; all trash must be taken away
Swimming and Fishing
Swimming: Available during summer only. Designated swimming areas are set, and lifeguards are on duty for safety.
Fishing: Fishing is possible around the island’s perimeter (some prohibited areas). You can catch fish such as horse mackerel, rockfish, and scorpionfish. However, you must bring your own fishing gear.
Precautions and What to Bring When Visiting Sarushima
Essential Items to Bring
- Beverages: While there are vending machines on the island, they may sell out during summer
- Sunscreen and Hat: There are many shaded areas, but the observation deck and beach have strong sunlight
- Insect Repellent: Essential, especially during summer, given the abundance of nature
- Comfortable Walking Shoes: The tunnel and trails are slippery in some places
- Trash Bags: Trash removal is required
- Camera/Smartphone Charger: With many photo spots, pay attention to battery level
Clothing Recommendations
- Easy-to-move-in clothes: Many stairs and slopes
- Long sleeves and long pants recommended: To prevent insect bites and sun damage, and to protect skin from ivy and branches
- Well-broken-in shoes: Avoid sandals and heels; sneakers are best
Facilities and Precautions on the Island
Restrooms: Located near the pier and beach area. As their number is limited, it’s recommended to use them beforehand
Food: No restaurants on the island except summer beach houses. Bring food with you or have meals in Yokosuka
Trash: No trash cans are installed. Everything must be taken with you
Cell Phone Reception: Some areas have weak cellular signals
Safety:
- Never enter off-limits areas
- Don’t touch or climb on ruins as they are deteriorating
- Pay attention to slippery areas
- Take full precautions against heatstroke during summer
Enjoy Alongside Yokosuka Sightseeing
Mikasa Park and Memorial Ship “Mikasa”
Next to the ferry terminal is Mikasa Park, where the battleship “Mikasa,” which played an active role in the Russo-Japanese War, is preserved and displayed. It’s an ideal spot to visit before or after your Sarushima visit.
Admission: 600 yen for adults
Time Required: Approximately 40 minutes to 1 hour
YOKOSUKA Harbor Cruise
Take a ship around Yokosuka Harbor to view the Maritime Self-Defense Force and U.S. Navy ships up close. You can experience Yokosuka’s appeal from a different angle than Sarushima.
Time Required: Approximately 45 minutes
Fee: 2,000 yen for adults
Departures: 2 to 4 departures per day
Dobuita Street
A shopping street near the U.S. military base with an American atmosphere. Many restaurants serve Yokosuka specialties like “Navy Burger” and “Navy Curry.”
Verny Park
A beautifully designed French-style garden park, also known as a rose garden. It offers an excellent viewpoint overlooking the Yokosuka military port across the water.
Kannonzaki Park and Kannonzaki Lighthouse
Located about 20 minutes by car from Sarushima, Kannonzaki is a promontory at the entrance of Tokyo Bay. You can enjoy Japan’s first Western-style lighthouse, the Kannonzaki Lighthouse, and beautiful coastlines.
The Appeal of Sarushima by Season
Spring (March to May)
- Features: Beautiful fresh greenery, pleasant weather
- Highlights: Spring flowers, budding trees
- Crowding: Relatively uncrowded
- Recommendations: Nature observation, photography
Summer (June to August)
- Features: Most popular season, swimming available
- Highlights: Lush greenery, clear sea
- Crowding: Very crowded (especially on weekends)
- Recommendations: Swimming, barbecue
- Note: Heatstroke prevention essential, early arrival recommended
Autumn (September to November)
- Features: Cool and comfortable, beginning autumn foliage
- Highlights: Autumn plants, subdued atmosphere
- Crowding: Moderately crowded
- Recommendations: Exploration, history discovery
Winter (December to February)
- Features: Ferry is closed
- Unavailable: Cannot land during this period
Frequently Asked Questions (FAQ)
Q: Is Sarushima really the model for Laputa?
A: While not officially designated as the model, the atmosphere of the moss-covered fortress ruins resembles “Castle in the Sky Laputa,” so it has become a topic among fans calling it “like Laputa.”
Q: Can you enjoy it on rainy days?
A: You can visit if the ferry operates in rain, but be careful as the ground becomes slippery. Service is suspended during rough weather.
Q: Is it okay for families with children?
A: The trails are well-maintained, but there are many stairs and slopes, so caution is necessary with small children. Moving with a stroller is difficult.
Q: Can I bring pets?
A: Pets are allowed, but they must be on a leash. Some areas may have access restrictions.
Q: Can you stay overnight?
A: Sarushima is an uninhabited island with no lodging facilities. Day trips only.
Q: Can I visit in a wheelchair?
A: Many stairs and unpaved roads on the island make wheelchair movement extremely difficult. No wheelchair accessibility has been provided.
Conclusion: An Adventure into the Extraordinary at Sarushima
Sarushima, an uninhabited island in Yokosuka City, Kanagawa Prefecture, is a precious spot where you can experience the world of “Castle in the Sky Laputa” with access of just about an hour from central Tokyo.
The fortress ruins remaining since the Meiji period, moss-covered brick tunnels, and stone walls being reclaimed by nature invite visitors into the world of the film. Sarushima, which combines historical romance, natural beauty, photogenic scenery, and convenient accessibility, is ideal as a date spot for couples, leisure for families, and a destination for solo travelers.
When combined with exploring Yokosuka’s streets and harbor cruises, you can spend a fulfilling day. Sarushima is recommended not only for Ghibli fans but for all who love ruins, history, nature, and more. This coming weekend, why not embark on an extraordinary adventure on this mystical uninhabited island floating in Tokyo Bay?
Sarushima, where time seems to have stopped and where you can feel the powerful force of nature, will surely give you special memories.
