Izena Castle, Ryukyuan stone fortress on Izena Island, Japan
Izena Castle is a Ryukyuan limestone fortress located on the southeastern side of Izena Island at approximately 100 meters elevation. The structure is defined by three vertical cliff faces, with access reached via stairs from the northern approach.
Samekawa Ufunushi, son of the Yogura Chief from Iheya Island, built this defensive structure in the 14th century during the early Ryukyu Kingdom period. This makes it one of the early fortifications of that era.
The castle grounds hold several sacred utaki enclosures that remain central to local spiritual practices. Visitors can observe how these spaces continue to serve religious purposes in daily island life.
To reach the castle, take the ferry from Unten Port to Nakata Port on Izena Island, which takes about 55 minutes. Plan for time to climb comfortably to the summit, as the route involves stairs.
The castle walls are constructed from stacked Ryukyuan limestone pieces that rise up to three meters high. This local building technique shows how early fortifications made use of the island's natural materials.
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