Qualla: Tomogashima

Tomogashima: Introduction

Thu, 12 Feb 2026 00:00:00 GMT

Photo credit Sakumata, CC0. The red-brick walls are still standing, but the jungle is winning. Vines thread through empty gun slits, tree roots pry apart mortar joints, and ferns colonize the powder magazines where Imperial Japanese Army soldiers once stacked artillery shells. On Tomogashima, a cluster of four uninhabited islands guarding the southern entrance to Osaka Bay, nature has spent eight decades reclaiming a military fortress that was once so secret it was erased from civilian maps. Visitors who make the twenty-minute ferry crossing from Kada Port in Wakayama City step into an atmosphere so hauntingly overgrown that it has drawn comparisons to Laputa, the floating castle in Hayao Miyazaki's 1986 film Castle in the Sky.

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Image: Sakumata | CC0

Tomogashima: Monks on the Cliffs

Thu, 12 Feb 2026 00:00:00 GMT

Photo credit Sakumata, CC0. Long before the gun batteries arrived, Tomogashima belonged to ascetic monks. Folklore holds that Ennogyoja, the founder of Shugendo -- a rigorous blend of mountain Buddhism, Shinto, and Taoist practice -- trained on the steep sea cliffs of the islands during the seventh and eigh...

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Image: Sakumata | CC0

Tomogashima: Fortress at the Strait's Mouth

Thu, 12 Feb 2026 00:00:00 GMT

Photo credit Japan Post, Public domain. Geography made Tomogashima irresistible to military planners. The Kitan Strait, the narrow passage between the southern tip of Awaji Island and the Wakayama coast, is the gateway to Osaka Bay. In 1888, the Japanese government designated the islands a military zone and began const...

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Image: Japan Post | Public domain

Tomogashima: The Jungle Takes Over

Thu, 12 Feb 2026 00:00:00 GMT

Photo credit 秋空から蛇が降ってきた, Public domain. After Japan's surrender in 1945, the weapons were stripped and the soldiers left. The islands were absorbed into Setonaikai National Park, but no one bothered to demolish the fortifications. Subtropical humidity and salt air did what no invading fleet ever attempted. Moisture cre...

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Image: 秋空から蛇が降ってきた | Public domain

Tomogashima: Painted by Masters, Forgotten by Time

Thu, 12 Feb 2026 00:00:00 GMT

Photo credit 藤谷良秀, CC BY-SA 4.0. Tomogashima's strange beauty caught the attention of artists centuries before the first tourists arrived. In 1661, the celebrated Edo-period painter Kano Tan'yu produced a scroll depicting the islands, now held at the Shogo-in temple in Kyoto. An anonymous handscroll from 1798 re...

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Image: 藤谷良秀 | CC BY-SA 4.0