Site of Kikuchi Castle

Yamaga, Kumamoto, Japan, Japan

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The Site of Kikuchi Castle is an ancient Korean‑style mountain fortress located near Yamaga in Kumamoto Prefecture, Kyushu, Japan, originally built around the late 7th century by the Yamato imperial court.

It sits on a plateau between about 90 and 171 meters above sea level, with the castle area covering roughly 55 hectares and fortified walls extending about 3.5 kilometers around the ridge. The site was used from the Asuka period into the mid‑10th century as a strategic inland stronghold controlling grain, soldiers, and transport routes near the Kikuchi River basin. 

Today the ruins are protected as a National Historic Site and have been developed into Kikuchi Castle Historical Park, where visitors can see reconstructed buildings such as the octagonal drum tower, rice storehouse, barracks, and wooden storehouse alongside archaeological remains of gates, reservoirs, and waterworks.