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Tomogashima Island Wakayama – Ruined Forts, Hiking Trails and Island Adventure

Tomogashima Island Wakayama – Ruined Forts, Hiking Trails and Island Adventure
Off the coast of Wakayama City, Tomogashima is an uninhabited island group famous for Laputa-like fort ruins, lush forests and sweeping sea views. This guide covers the Third Battery, lighthouse viewpoints, seasonal hiking routes, ferry access from Kada, what to pack and safety tips so first-time visitors and families can enjoy a memorable day of exploration.

Highlights

Tomogashima Islands at a Glance

Tomogashima is a group of uninhabited islands off Wakayama City. It’s introduced as an island trip where abandoned artillery ruins blend with untouched nature—sometimes compared to a “Laputa-like” atmosphere.

Explore the Ruins of the Third Battery

The Third Battery Ruins are a photogenic spot where brick structures are covered in greenery. You can see remnants of a coastal defense site dating from the late 19th century through the World War II period.

Nature Hikes and Scenic Views

Hiking trails let you enjoy forests and coastal scenery on foot, and viewpoints are described as offering views of the Kitan Strait, Awaji Island, and the Akashi Kaikyo Bridge.

Lighthouse and Sunset Photo Time

Tomogashima Lighthouse is a symbol of the island and a popular photo spot. Sunset hours are introduced as especially beautiful.

Wildlife Encounters

On Tomogashima, you may encounter wild deer and birds. A quiet walk is described as a way to feel the island’s closeness to nature.

Access (Ferry from Kada Port)

From Nankai Kada Line “Kada Station,” walk about 20 minutes to Kada Port, then take a ferry (about 20 minutes). By car, it’s about 50 minutes from Wakayama IC on the Hanwa Expressway, with parking around the port.

Ferry Fare and What to Bring

The ferry fare is introduced as a round trip of about 2,500 yen for adults and 1,250 yen for children. Bring comfortable shoes and a camera for walking the ruins and trails, plus water and light snacks. In darker areas with uneven footing, prioritize safety.

For the latest information, please refer to official announcements or check on site.

What Is Tomogashima? Ruins of Coastal Batteries and Nature on Wakayama's Uninhabited Islands

The Tomogashima Islands (Tomogashima) are a group of uninhabited islands off the coast of Wakayama City, Wakayama Prefecture, in the Kitan Strait, made up of four islands (Okinoshima, Jinoshima, Torajima, and Kamishima).

It is designated as part of Setonaikai National Park, and Okinoshima in particular is known as the center of sightseeing on Tomogashima.

Ruins of coastal batteries built in the Meiji period as part of the Yura Fortress to defend the Kitan Strait are scattered across the islands, creating a unique landscape where brick ruins and lush nature blend together.

It is sometimes called "Laputa Island" because it reminds visitors of the world of "Castle in the Sky."


Top Things to See on Tomogashima

1. Third Battery Ruins: The Most Famous Highlight

One of Tomogashima's most famous highlights, the Third Battery Ruins, is a fantastical spot where brick ruins are covered in greenery.

The Third Battery Ruins were one of the Yura Fortress batteries built to defend the Kitan Strait, and together with the First to Fifth Battery Ruins on the island, they preserve the area's military history.

Mortar-shaped gun emplacements and underground facilities (such as shell storage rooms) remain, and you can go down by stairs to explore the underground area.

The site is said to be well preserved, but some places are dark or have uneven footing, so please be careful.

The interior is dark, so bringing a flashlight is recommended.

2. Untouched Nature and Scenic Hiking

Tomogashima is home to a variety of plants, and the island's hiking courses offer forest and coastline scenery.

A model hiking course covering the main spots takes about 2 hours and 30 minutes as a standard estimate, and the moderate ups and downs make for a pleasant walk.

From observation points, you can enjoy sweeping views over the Kitan Strait.

3. Tomogashima Lighthouse

Tomogashima Lighthouse is a historic Western-style stone lighthouse first lit in 1872 (Meiji 5), and it is one of the island's symbolic landmarks.

It is designated as a Registered Tangible Cultural Property, and the area around the lighthouse is popular as a photo spot.

Tomogashima is also known as the southernmost place through which the Japanese Standard Time meridian (135° east longitude) passes.

4. Encounters with Wildlife

On Tomogashima, you may encounter wild Taiwan squirrels and deer (Taiwan sika deer hybrids).

If you walk quietly around the island, you may suddenly sense the presence of nature and animals in unexpected moments.

5. An Adventure Unique to an Uninhabited Island

Tomogashima is a place that sparks a sense of adventure unique to an uninhabited island.

From the First Battery to the Fifth Battery, multiple battery ruins remain across the island, and by freely walking through the ruins and nature, you can fully enjoy the feeling of exploration.

A campground is also available, and with advance reservation you can stay overnight on the island and enjoy the sunset and starry sky.


Best Time to Visit Tomogashima by Season

  • Spring (March to May): A season of beautiful fresh greenery, ideal for hiking and walking. Temperatures are mild and comfortable for exploring.
  • Summer (June to August): You can enjoy picnics and adventure under blue seas and skies. During some periods, ferry services increase, making access easier.
  • Autumn (September to November): Autumn leaves color the island, making the scenery even more beautiful. The cool weather is also comfortable for hiking.
  • Winter (December to February): Service days may be limited in some periods, but there are fewer tourists, so you can explore the island slowly in a quiet environment.

How to Get to Tomogashima

Address

Kada, Wakayama City, Wakayama Prefecture

Access

  • Train and ferry
  • From Nankai Electric Railway Kada Line "Kada Station," walk about 20 minutes to Kada Port.
  • From Kada Port, take the Tomogashima Kisen ferry for about 20 minutes.
  • Car
  • From the Hanwa Expressway "Wakayama IC," it takes about 50 minutes to Kada Port.
  • There is paid parking near the port (700 yen per day).

Ferry Service Information

  • Operating hours: Ferry timetables vary by season. In the regular period, there are generally 4 departures per day (9:00, 11:00, 13:00, and 16:00). Additional services may operate during Golden Week and summer vacation periods. In the regular period, service is usually suspended on Wednesdays, and in winter there are periods when operating days are limited.
  • Fare: Round trip 2,500 yen for adults / 1,250 yen for children.
  • Notes: On busy days, same-day boarding queue tickets may be distributed, and services may be canceled in bad weather, so check the operating status before departure.


Best Things to Do on Tomogashima

1. Explore the Ruins

Visit the ruin areas including the Third Battery Ruins and enjoy their unique atmosphere.

Bringing a camera is recommended so you can capture magical scenes such as moss-covered brick walls and sunlight filtering into former ammunition storage rooms.

2. Hike the Island Trails

Walk the hiking courses on Tomogashima and enjoy nature and scenic views to the fullest.

The model course covering the main spots takes about 2 hours and 30 minutes as a standard estimate.

Because there are moderate ups and downs, it is best to visit in comfortable clothing suitable for walking.

3. Picnic and Photography

The areas around Tomogashima Lighthouse and Nonoura Plaza are perfect spots for a picnic.

Bring a packed lunch and spend a relaxing time while looking out over the island's beautiful scenery.


Travel Tips for Visiting Tomogashima

What to Bring and What to Wear

  • Comfortable walking shoes: Sneakers or trekking shoes are recommended for walking through the ruins and hiking courses.
  • Drinks and light snacks: Drinks are sold only around Nonoura Plaza, so it is recommended to prepare what you need for your walk in advance.
  • Flashlight: The inside of the battery ruins is dark, so a smartphone light or flashlight is useful.
  • Camera: Essential for photographing the island's unique scenery.

Things to Keep in Mind

  • Safety first: Some parts of the ruins are dark and have unstable footing, so be careful not to enter restricted areas.
  • Watch the return ferry: Make sure to return to the pier with enough time so you do not miss the last ferry.
  • Protect the environment: Take your trash home and help protect nature.

Tomogashima is a special destination where nature, history, and adventure come together.

Enjoy the mysterious charm of this uninhabited island, also known as "Laputa Island," and experience an unforgettable adventure trip!


Frequently Asked Questions

A. Tomogashima is a collective name for islands off Wakayama City, popular for the atmosphere of former military fort ruins. Some paths feel like a tunnel through the forest; in photos, placing a person small in the frame can emphasize the mood. The island has ups and downs, so sturdy walking shoes are essential, and carrying extra drinks is reassuring.
A. To reach Tomogashima, take the Tomogashima Kisen ferry from Kada Port; about 20 minutes is a common guideline. Fares are about 2,200 yen round trip for adults and 1,100 yen for children (one-way: 1,100 yen for adults and 550 yen for children). Ferries may be canceled in rough seas, so checking the day’s sailing status before heading out is reassuring.
A. A day trip is enough to enjoy the island. If you plan to visit several fort ruins, allowing about 2–4 hours is a comfortable range. Ferry services are limited, so once you arrive, note the approximate return time and plan backward to avoid rushing. If you stop often for photos, sharing space at viewpoints makes walking more pleasant for everyone.
A. The Third Battery Ruins are a popular spot, about a 20–30 minute walk from Nonoura Pier as a guideline. Taking a gentler path on the way there and returning via a different route can add variety. Tunnels can be dark, so a small dedicated light is safer than relying only on a phone light.
A. Food and shops are mostly limited to the Nonoura area, and depending on timing you may not be able to buy anything. Bringing water and snacks is the standard approach. There are few trash bins, so carrying a trash bag and taking everything back is the neat way to do it. It’s also reassuring to locate restrooms soon after you arrive.
A. Some fort sites have risks such as crumbling structures or falls, so never go beyond “No Entry” signs. Wet footing can be slippery, especially after rain. Instead of climbing onto ruins, adjusting your composition from stable ground lets you take photos more safely.
A. There is a campground on Tomogashima, so you can spend time in nature. Swimming depends on location and season, and following safety signage is a given. Nights get very dark, so even on a day trip, a headlamp can be reassuring. Summer brings more insects, so long sleeves and insect repellent make it more comfortable.
A. You can still land in the rain, but ferries may be canceled due to strong wind or high waves. On days when cancellations are possible, switching to a walk around the port town of Kada or visiting an onsen can keep your time well spent. Surfaces on the island can be slippery, so in wet weather it’s safer to focus around Nonoura rather than going deep into the ruins.

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