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Tomogashima: Japan's 'Castle in the Sky'

Explore Tomogashima: Hike through historic military ruins and lush landscapes on these captivating islands off the coast of Wakayama, Japan.

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Tomogashima, a group of four uninhabited islands off Wakayama, Japan, blends natural beauty with historical intrigue. Once a secret military base, the islands now offer hiking trails through overgrown ruins, reminiscent of Studio Ghibli's 'Castle in the Sky'. Explore abandoned forts, scenic overlooks, and a charming lighthouse.

A brief summary to Tomogashima

Local tips

  • Bring a flashlight if you plan to explore the tunnels in the Third Battery Ruins, as some sections are very dark.
  • Wear comfortable shoes suitable for hiking, as the trails can be uneven and steep in places.
  • Pack snacks and drinks, as facilities on the island are limited.
  • Check the Tomogashima Ferry schedule in advance, as services are subject to change due to weather conditions and seasonal variations.
  • Consider visiting during the off-season for fewer crowds and a more peaceful experience.
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Getting There

  • Public Transport

    To reach Tomogashima, take the Nankai Kada Line from Wakayama-shi Station to Kada Station. From Kada Station, it's a 20-minute walk to Kada Port. From there, the Tomogashima Ferry provides a 20-minute ride to the island. A round-trip ferry ticket costs ¥2,200 for adults and ¥1,100 for children.

  • Walking

    From Kada Station, follow the signs to Kada Port, which is approximately a 20-minute walk. The path is well-marked and relatively flat. Once at Kada Port, purchase your ferry ticket and board the Tomogashima Ferry for a 20-minute ride to the island. Round-trip ferry tickets are ¥2,200 for adults and ¥1,100 for children.

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Discover more about Tomogashima

Tomogashima, meaning 'Friend Islands,' is a cluster of four islands – Okinoshima, Jinoshima, Torajima, and Kamishima – located in the Kitan Strait off the coast of Wakayama. Okinoshima, the largest, is the primary destination for visitors. These islands, now part of the Setonaikai National Park, boast a unique combination of natural landscapes and historical remnants. From the Meiji period (1868-1912) through World War II, Tomogashima served as a strategic military site, playing a critical role in defending Osaka Bay. The Imperial Japanese Army constructed gun batteries, ammunition depots, and other fortifications, strictly prohibiting public access until after the war. Today, the abandoned ruins stand as silent witnesses to the islands' military past, offering visitors a glimpse into Japanese history. The most popular activity on Tomogashima is hiking through the network of trails that wind around Okinoshima. These trails lead to various points of interest, including the Third Battery Ruins, the largest and most well-preserved of the former military structures. Visitors can explore the interconnected tunnels and chambers, some of which are pitch black, adding an element of adventure. Other notable sites include the Tomogashima Lighthouse, built in 1872, and observation decks offering panoramic views of the Kitan Strait. The islands' unique atmosphere, where nature reclaims the man-made structures, has drawn comparisons to Studio Ghibli's 'Castle in the Sky'. The red brick ruins covered in moss create a surreal and captivating environment. Tomogashima also offers opportunities for camping and picnicking, allowing visitors to immerse themselves in the tranquility of the islands. Keep an eye out for the peacocks that roam the island, introduced to control the snake population.

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