Gushikawa Castle (Itoman)

Gushikawa Castle, known locally as Gushichan Gushiku, is a historic Ryukyuan gusuku fortification situated on the coastal cliffs of Kyan in Itoman City, at the southernmost tip of Okinawa Island, Japan. Constructed in the late 12th century using Ryūkyūan limestone and wood, the structure features a unique layout surrounded by the sea on three sides. The site measures approximately 83 meters east-to-west and 33 meters north-to-south, comprising two main sections: the Ichino-Kuruwa, which juts out like a peninsula and served as the primary bailey, and the Nino-Kuruwa, separated by a plaza. Notable architectural remnants include traces of cut stone at the main gate and a distinctive natural hole known as the Heefuchimi or Sufuchimi, which connects the interior to the coast.

The castle holds significant historical value, with oral traditions recorded in 1743 suggesting it was built by Makanekui Anj, a lord who fled from Kumejima following a political conflict. Archaeological excavations have supported the site's antiquity by uncovering Chinese ceramics, including celadon and white porcelain, indicating occupation from the late 12th century through the mid-15th century. These findings highlight the castle's role in regional trade and defense during the formative years of the Ryukyu Kingdom. The ruins were officially designated a National Historic Site of Japan on May 15, 1972, recognizing their cultural importance.

Today, Gushikawa Castle exists as well-preserved ruins that are open to the public. Visitors can explore the remaining stone walls, view the dramatic coastal scenery from the ramparts, and observe the layout of the ancient baileys. While no original wooden structures survive, the enduring limestone fortifications offer a tangible connection to Okinawa's feudal past. The site serves as both a protected monument and a scenic destination for those interested in the military architecture and complex history of the Ryukyu Islands.