is a Japanese castle in Usuki, Ã Âita Prefecture, Japan. Another name of this castle is .
This castle was constructed by à Âtomo Sà Ârin in 1562 on the island Nyà «-jima, in Usuki Bay as his head castle. During the 1560s, Sà Ârin had the largest territory in Kyà «shà «. However, after defeat at the Battle of Mimigawa in 1578, the power of Sà Ârin and the à Âtomo clan rapidly declined. In 1586, this castle fell to Shimazu Yoshihiro, a daimyà  of Kagoshima, but was rescued by Toyotomi Hideyoshi.
William Adams, basis for the character in the novel Shà Âgun by James Clavell, stayed in the castle upon his arrival in Japan.