Tomogashima, Island group in Wakayama, Japan.
Tomogashima is an island group in the Seto Inland Sea within Setonaikai National Park, consisting of Jinoshima, Kamishima, Okinoshima, and Torajima. The islands lie off the coast of Wakayama and feature forested hills, abandoned brick structures, and narrow walking trails that wind along rocky shorelines and through dense greenery.
Military engineers built brick fortifications with gun batteries during the Meiji Restoration to protect Osaka Bay from potential attacks by foreign fleets. The facilities were abandoned after World War II and nature slowly reclaimed the deserted structures, creating today a mix of military heritage and wild vegetation.
Japanese pilgrims used these islands as a spiritual retreat for centuries, meditating along steep cliffs and performing ascetic practices. The military-era remains have become popular photo spots, where modern visitors walk between crumbling fortress walls and experience the connection between nature and past defenses.
Visitors should wear sturdy shoes as the paths are uneven and sometimes steep, with some areas becoming slippery after rain. It's advisable to bring water and snacks, as there are no shops or vendors on the islands and exploring can take several hours.
Peacocks roam freely across the islands and were originally introduced to naturally reduce the snake population. Their bright feathers and loud calls surprise hikers who wouldn't expect these exotic birds in a forested Japanese coastal setting.
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